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 Click to VISIT or RETURN CLICK HERE  To go back to the Slide Rule Marketplace Thanks to the Oughtred Society Journal (Vol 6, No.1, March 1997) and the author Hans Dennert for some of the reference material used here. Interested collectors should obtain the original issue for a more in-depth discussion of these rules, and the companies involved. The Aristo Model Number List below was complied by John Mosand of Norway. Any technical or historical errors in this section are probably mine.        Aristo Models Currently Known: 1 1/150 Junior demo, 10 Puck (10 cm), 100 OH Projection-scale, 10046 ?, 10048 Temperature radiation, 10052 Dämpfung, 10076 For chemists, 10096 System Dr. Peters, 101 Junior overhead, 10101 System Blechstein, 10102 System Blechstein, 10103 Dew point, 10125 Galvanotechnisch, 10132 Lagermatten, 10133 Philips Cinema, 1014 Elektro, 10144 ?, 1015 Exponential, 10174 Nuclear radiation, 10175 Electronic, 10176 Wire rope, 1019 Präzision, 102 JuniorTrig overhead, 1023 Tachymeter, 1023 Tachymeter 400 deg., 103 VS Scholar overhead, 103 LL Scholar demo, 1045 Praktiker (50 cm), 1048 Universal tachy. (50 cm), 1048 Univ. tachy. 400 deg. (50 cm), 1055 Commerz I (50 cm), 106 Bi-Scholar overhead, 1065 Insurance, 1067 Darmstadt (50 cm), 1067U Darmstadt (50 cm), 01068 Studio (50 cm), 107 CommerzJunior overhead, 01070 MultiLog (50 cm), 108 TriLog overhead, 1084 Electro, 109 Rietz (50 cm), 109 Rietz 400 deg. (50 cm), 11 Puck (10 cm), 11/150 Simplex demo, 150 Rietz demo, 16 Piccolo (10 cm), 168 Studio overhead, 169 StudioLog overhead, 170 MultiLog overhead, 170104 Militar, 1801 Graphic AC-computer 2 201 Junior slide projection, 203 Scholar slide projection, 206 BiScholar slide projection, 208 TriLog slide projection, 29/150 MultiRietz demo 3 3/100 Scholar demo, 3/150 Scholar demo, 3LL/150 Scholar LL demo, 3VS/150 Scholar VS demo, 301 Junior demo, 302 JuniorTrig demo, 303 Scholar demo, 303LL Scholar demo, 303VS ScholarVS demo, 306 BiScholar demo, 307 CommerzJunior demo, 308 TriLog demo, 368 Studio demo, 370 MultiLog demo 4 40104 ?, 40151 Maschinenzeit, 048 Temperaturstrahlung 5 5/150 Commerz demo, 052 Dämpfung 6 6/150 BiScholar demo, 60112 Repro Klimsch, 60115 ?, 60138 Duplomat, 60142 Financial, 60147 Brennstoff, 60149 Naviguide, 60153 Astrology, 60160 Prozent, 60168 Steel weight, 602 Prozent computer, 0602 Financial, 603 Prozentrechner, 604 Financial, 605 Financial, 606 Prozent-Calculator, 609 ?, 610 Aviat, 613 Aviat, 614 Aviat Sport, 615 Aviat, 615W Aviat, 616G Aviat, 617 Aviat, 617P Aviat projection, 617W Aviat, 620 Circular computer, 621 Conversions, 622 Calculator, 623 Commerz III, 630 Chemie System Dr. Bückle, 647 Aviat Jet, 647BD Aviat Jet, 647HF Aviat Jet, 661 Naviat, 670 Car key chain, 671 Car key chain, 67/150 Darmstadt demo, 680 Stadia Computer, 68/150 Studio demo 7 70/150 MultiLog demo 8 ? Sumit (pocket), 8/150 TriLog demo, 80109 ?, 80115 ?, 80123 Martin Space Rule, 80135 Valmet, 80136 Lagermatten, 80147 GEA Luftkühler, 80148 ?, 80161 System Dr. Reiner, 80169 ?, 803 Rietz, 803 Scholar, 807 Flex, 81 (10 cm), 810 Puck (10 cm), 811 ?, 812 Simplex, 814 Elektro, 815 Elektro, 816 Piccolo (10 cm), 819 Präzision, 082 ? (13 cm), 829 Technica, 829 MultiRietz, 829 MultiTrig, 843 Kaufmann Stender, 845 Commerz I, 845 Praktiker, 852 Telefonbau, 860 Darmstadt, 865 Commerz, 865 Commerz II, 867 Darmstadt, 867U Darmstadt, 867U Darmstadt 400 deg., 868 Studio, 869 StudioLog, 870 MultiLog, 89 Rietz, 89 Rietz 400 deg., 89NZ Rietz, 890 Rietz 9 9/150 Rietz demo, 0901 Junior, 0911 Simplex, 90110 Krupp Rohstoffe, 90117 Aquamat, 90123 Bodytest Syst. Utz, 90124 Dynamit-Nobel, 90162 Weather, 90183 Scholar Christiani, 90184 Baustahl, 90189 Brit. Inst. of Engin., 0902 Junior Trig, 902 Junior Trig, 902 Scholar, 903 Scholar, 0903 Scholar, 903LL ScholarLL, 0903LL ScholarLL, 0903VS ScholarVS, 0903VS-2 ScholarVS-2, 905 Commerz, 0905 Commerz, 0905 Schul-Commerz, 0906 BiScholar, 0906LL BiScholarLL, 907 Flex, 0907 Commerz-Junior, 0908 TriLog, 0909 MultiTrig, 909 MultiRietz, 0911 Simplex, 911 Simplex, 914 Elektro, 915 Elektro, 915E Elektro, 916 Gewicht nach Stockhausen, 918 Kanalisation syst. Vicari, 919 Präzision, 92 Normal, 920 Federfix, 921 Tau-Max, 922 Temperaturstrahlung, 927 MultiLog, 929 Technica, 929 MultiTrig, 929 MultiRietz, 0929 MultiTrig, 0929 MultiRietz, 930 Textil, 939 Concrete syst. Göttsch, 940 Concrete syst. Göttsch, 943 Kaufmann Stender, 945 Commerz I, 945 Praktiker, 947 Materialprüfung, 948 Univ. Tachymeter, 948 Univ. Tachymeter 400 deg., 949 Elektro, 95 Schule, 950 Polifax, 95 1/2 ?, 952 Dämpfung, 955 Commerce I, 956 Blindflug, 958 Geodät, 958 Geodät 400 deg., 0958 Geodät, 0958 Geodät 400 deg., 96 SchulRietz, 960 Rohrleitung Rehrens, 965 Commerz, 965 Commerz II, 966 Scholar, 966H Log-Log, 967 Darmstadt, 967D Darmstadt, 967U Darmstadt, 967U Darmstadt 400 deg., 968 Studio, 0968 Studio, 0968 Studio 400 deg., 969 StudioLog, 0969 StudiLog, 970 MultiLog, 0970 MultiLog, 971 Hyperbolog, 0971 Hyperbolog, 0972 Hyperlog, 98 Rietz, 981 Exponential, 99 Rietz, 99 Rietz 400 deg., 99k Rietz ? Soil Pressure, ? A large 'drum type' (three drums) with 10m (33feet) scales for trigonometric calculations. (WWII), HR 1 Cylindrical Nautical Astronomic, DR 3 Air Navigation Planimeters: 1100, 1100L, 1130, 1130L, 1137, 1137L, 1138, 1138L, 1141, 1145, 1148, 1181 Electronic pocket calculators: M16, M27, M36, M42, M64, M65, M66, M75, M76, M80, M85, M400, Top, Parat, Unilog |
  Aristo Slide Rules  Aristo rules in their various incarnations span over 100 years of production, and begin with Dennert and Pape (Workshop for Mathematical Instruments) in 1863. The founders (Johann Christian Dennert and Martin Pape) started in Hamburg, Germany, and then moved to Altona, Prussia. Their original business consisted of 'Theodolites, Levels, Leveling Rods, Planimeters, Drawing Instruments and Scales with any graduation, made of ivory, brass, nickel silver, or silver-plated brass'. In 1872, they produced their first boxwood slide rules, and changed their name to Dennert & Pape, Mechanical-Mathematical Institute.
In 1879, they introduced brass body slide rules, and in 1886 were granted their patent (DRP 34583) for wooden rules with celluloid scales. In 1888 they switched from boxwood to mahogany bodies for their rules. In 1902, Max Rietz designed the slide rule scale arrangement that would live on under his name for the next century, 'System Rietz'. In 1924, the DUPA trademark was introduced for their products. Prof. Dr. Alwin Walther (from the Institute for Applied Mathematics, Technical University, Darmstadt) developed a new scale arrangement based on the 'Rietz' design with added log log scales, and the 'Darmstadt' model was born. It is significant that these designs literally became standards for all production in Europe, and were more conceptually advanced and better organized than most north american scale designs.
In 1936, D & P mahogany body rules were discontinued, and production changed to engineering plastics with the trademarks Astralon and Plexiglas. The new trademark, ARISTO, was also introduced for anything made with these new plastic materials, while other traditional tool designs continued to be marked as Dennert & Pape. In 1937, the Altona location became part of Hamburg, and the DR-2 flight computer designed by Plath, and made of plastic materials, was produced. Military products were marked with 'gwr' starting in 1942, and have no company identification. Due to wartime shortages, production was almost stopped in 1945, and remained weak until 1948, when the company was re-organized, and then marketed under the name ARISTO.
Duplex rules begin production in 1949, and included designs with six log log scales. The massive Aristo Multi-log design with eight log log scales was introduced in 1953, and the advanced Aviat flight computers started in 1954. The company celebrated its 100th anniversary in 1962, and introduced an elementary school rule called the Aristo-Junior. The advanced Aristo-StudioLog, their most advanced rule, was introduced in 1967. Aristo used yellow accent stripes on the base scales (C and D) as a style trademark on many rules. Their rules were of exceptional quality, and had a distinctive clean and readable design. The 100th year of slide rule production passed in 1972, but sadly, only a few years later, 1978 marked the end of slide rule production, and the liquidation of that portion of the company. The company continued after that as a CAD company under the name Aristo Graphic Systeme.
Part Number Decoder: 1xx, Projection rules, overhead 2xx, Projection rules 6xx, 3+in / 8+cm Circulars 8xx, 5in / 12.5cm (also 10 and 13cm) Pocket Rules 9xx, 10in / 25cm Full Sized Rules 10xx, 20in / 50cm Oversized Rules xx/150, 5ft / 150cm Demonstration rules Note: there ARE exceptions to these general groupings, but they are a useful guide.  CLICK for Company History  CLICK for Scale Index The illustrated archive will appear below shortly.... |
 Original Aristo Catalog Page for these rules (1969) |
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Reitz 89 |
6"/5" Aristo Pocket Slide Rule Rietz format rule, with leather case, and manual. Has a slightly magnifying 4 line cursor, side cm ruler, back cursor for the trig scales, and leather case. Self-documenting, two-color scales. A really outstanding and versatile low cost plastic body pocket rule. (10 Scales + 1 cm ruler) Front - (cm), K, A, [ B, CI, C, ] D, L Back - [ S, ST, T] |
Projection Multilog 170  Click for bigger PIC!
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Aristo Projection Multilog Slide Rule, high end log log format rule. Has a parallel scale layout (shows both sides at once) Self-documenting, two-color scales, including folded, log log, DI and decimal trig scales. A beautiful design made of precision film strips, with a fitted travel case, and overhead projector attachment frame. This is an amazing deomonstration rule, very seldom seen anywhere. (24 Scales!) Front - LL00, K, A, [ B, T, ST, S, C, ] D, DI, LL0 Back - LL01, LL02, LL03, DF,[ CF, CIF, L, CI, C, ] D, LL3, LL2, LL1 |
Aviat 615  CLICK for BIGGER PIC
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5.5" Circular Aviation Slide Rule Constructed with one rotating film disk, and rotating cursor on each side. A very sophisticated and beautiful flight computer for doing altitude, pressure, time, temperature, and fuel problems. The rule give simultaneous solutions in both metric and US/Imperial units, without being cluttered or hard to interpret, an outstanding mechanical and artistic design. Still in demand today among many pilots, but very hard to find. The companion 617 model includes a drift chart for crosswinds and plotting, like the US E6B from Felsenthal. Made of 'Aristopal', came complete with zippered leather pouch, and manual. (22 scales on front, 6 scales on rear) Front - see image Back - see image |
Aviat 617  CLICK for BIGGER PIC
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5.5" Circular Aviation Slide Rule with flight chart Constructed with one rotating film disk, and rotating cursor on one side, and a rotating compass rose and rotating cursor on the other for use with the plotting table. A very sophisticated and beautiful flight computer for doing altitude, pressure, time, temperature, and fuel problems, plus drift and wind. The rule give simultaneous solutions in both metric and US/Imperial units, without being cluttered or hard to interpret, an outstanding mechanical and artistic design. Still in demand today among many pilots, but very hard to find. The companion 615 model has no chart. Made of 'Aristopal', came complete with zippered leather pouch, and manual. (22 scales on front, 4 scales and calibrated cursor on rear) Front - see image Back - see image |
 Original Aristo Catalog Page for these rules (1969) |
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Calculator 622  CLICK for BIGGER PIC
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4.7" Circular Calculator Slide Rule with one rotating yellow/clear film disk, and rotating single cursor. Simple rule made of thin plastic. Made of 'Aristopal', came complete with vinyl pouch, and manual. (5 Scales) Front - K, A, D, [ C, CI ] Back - [ BLANK ] |
Commerz III 623  CLICK for BIGGER PIC
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4.7" Circular Calculator Slide Rule with one rotating beige or yellow/clear film disk, and rotating single cursor. Black, green and red scales. Simple rule for financial/percentage/conversion use, made of thicker plastic. Made of 'Aristopal', came complete with leather pouch, and manual. (5 Scales) Front - Conversions, D, [ C, CI % ] Back - [ BLANK ] |
670  CLICK for BIGGER PIC  CLICK for BIGGER PIC
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Circular Pocket Slide Rule Keychain/rule combination for calculating time/distance on one side and gas milage on the other side, german markings. Black scales, with a rotating beige disk on each side, has attached slip case. Simple rule for driving use, made of plastic. (6 Scales) Front - distance, fuel, consumption Back - distance, time, speed |
 Original Aristo Catalog Page for these rules (1969) |
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Multirietz 829  Click for bigger PIC!
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6"/5" Aristo Multilog Pocket Slide Rule, advanced log log pocket rule. Has a slightly magnifying 6 line cursor, scale over-range extensions, CF/C accent color stripes (faint). Self-documenting, two-color scales, including folded, DI, P (Pythagorean) and decimal trig scales, PLUS inch and cm scales (does conversion and measuring!). Despite the high scale density, and small size, the scales are very readable and finely divided. This Aristo pocket rule is beautifully designed and built, with very unique inch/cm scales. Very seldom seen in North America. (18 Scales! includes two integral rulers) Front - cm, P, A, [ B, T, ST, S, ] D, DI, inch Back - K, DF,[ CF, CIF, CI, C, ] D, L |
SURVEYOR 939/0958 |
 Original Aristo Catalog Page for these rules (1969) |
845/955/1055 965/0905 |
 Original Aristo Catalog Page for these rules (1969) |
Commerz 845 |
6"/5" Aristo Business Pocket Slide Rules Commerz format rule for financial calculations. Has a slightly magnifying cursor, side cm ruler and leather case. Self-documenting, three-color scales, including currency conversion, interest, metric conversion, mark-up/discount. An interesting and useful plastic body pocket rule, seldom seen in North America. (8 Scales + 1 cm ruler) Front - (cm), KZ, [ DF, P, T1, ] Z, M Back - [ L, s/d] |
Darmstadt 867U  Click for bigger PIC!
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The Unusual 867U with the CLEAR sides! 6"/5" Aristo Darmstadt Log Log Pocket Slide Rules A unique format pocket rule with clear side rulers, the example shown has the factory box with leather case and inspection slip. Has a slightly magnifying 4 line cursor, inch and cm clear side rulers, log log scales on slide reverse. Self-documenting, two-color scales, Pythagorean (P) and BI cales, visually striking design, matches the 967U full size rule. Note that this type exists both with clear sides (later production), and white sides (original production), yet has the same part number.This is one of Aristo's most useful pocket rules, and is beautifully designed and built, very seldom seen in North America. One of my personal favorites.(14 Scales and 2 rulers!) Front - cm K, A, [ B, BI, CI, C, ] D, P, S, T inch Back - [ L, LL1, LL2, LL3 ] |
 Original Aristo Catalog Page for these rules (1969) |
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 Original Aristo Catalog Page for these rules (1969) |
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6"/5" Aristo Studio Pocket Slide Rules A high end log log format pocket rule, shown with the factory box, leather case, and original manual. Has a slightly magnifying 6 line cursor, CF/C and B/C accent color stripes (faint). Self-documenting, two-color scales, including folded, log log, P (pythagorean) and decimal trig scales. Despite the high scale density, and small size, the scales are very readable and finely divided. This is one of Aristo's most powerful pocket rules, and is beautifully designed and built. A wonderful compact log log plastic body pocket rule, very seldom seen in North America, and extremely powerful. (Incredible 23 Scales!) Front - ST, T1, T2, DF, [ CF, CIF, CI, C, ] D, P, S Back - LL01, LL02, LL03, A, [ B, L, K, C, ] D, LL3, LL2, LL1 |
870/0970/01070 |
 Original Aristo Catalog Page for these rules (1969) |
Multilog 870  Click for bigger PIC!
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6"/5" Aristo Multilog Pocket Slide Rule, high end log log format rule. Has a slightly magnifying 6 line cursor, CF/C accent color stripes (faint in this example). Self-documenting, two-color scales, including folded, log log, DI and decimal trig scales. Despite the high scale density, and small size, the scales are very readable and finely divided. This is one of Aristo's most powerful pocket rules, and is beautifully designed and built. A wonderful compact log log plastic body pocket rule, very seldom seen in North America. (Incredible 24 Scales!) Front - LL00, K, A, [ B, T, ST, S, C, ] D, DI, LL0 Back - LL01, LL02, LL03, DF,[ CF, CIF, L, CI, C, ] D, LL3, LL2, LL1 |
Scholar 0903-LL  CLICK for BIGGER PIC
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12"/10" Scholar Slide Rule student rule, complete in factory box with two part plastic hard case, inspection certificate, manual. Rear side rulers in inches and cm, reversible slide, 4 line cursor, 2 log-log scales, plus two color (red/black) scale markings with yellow accent stripes on body. Rule is self documenting on right hand side for all scales. Very unique visual style solid plastic body rule with two part red and white plastic case. (13 Scales) Front - L, K, A, [ B, CI, C, ] D, S, ST, T Back - [ S, LL2, LL3 ] |
 Original Aristo Catalog Page for these rules (1969) |
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Aristo Darmstadt 967U 
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CLICK for BIGGER PIC
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12"/10" Darmstadt Log Log Slide Rule Shown with inspection certificate. Side Ruler in inches, back ruler in cm, reversible slide, 4 line cursor, plus two color (red/black) scale markings. Rules have unusual BI and P (Pythagorean) scales, and log log scales on slide reverse. Rule is self documenting on right hand side for all scales. A very useful desktop rule, the full size version of the 867U. An excellent example in the older gray linen covered hard case. A newer version of this rule has a clear back body and rulers. (14 Scales, 2 Rulers) Front - in, K, A, [ B, BI, CI, C, ] D, P, S, T Back - [ L, LL1, LL2, LL3 ] cm |
Studio 0968  CLICK for BIGGER PIC
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 13"/10.5" Studio Slide Ruleset came complete with inspection certificate, manual, bag of tilt stands, and accessory ruler strip. 6 line cursor, two color (red/black) scale markings with yellow accent stripes on body, P (Pythagorean scale), folded and expanded trig scales. Rule is self documenting on right hand side for all scales. Very unique solid plastic body rule with two part light and dark gray plastic case, with accessory tilt stands to make desk use easier, and avoid cursor scratches. (23 Scales) Front - LL01, LL02, LL03, A, [ B, L, K, C, ] D, LL3, LL2, LL1 Back - S1, T1, T2, DF,[ CF, CIF, CI, C, ] D, P, S |
Aristo StudioLog 0969  CLICK for BIGGER PIC  CLICK for BIGGER PIC  CLICK for BIGGER PIC  CLICK for BIGGER PIC |
14.7"/10" StudioLog Slide Rule BRAND NEW, with chocolate brown leather case, bagged tilt stands, and model 1364 accessory ruler, see it HERE and HERE. Massive body, almost 3 inches tall by over 14 inches long, yellow accent stripes, 4/6 line cursor, plus two color (red/black) scale markings, anti-skid bumpers, and elevated body design to prevent cursor damage when set down. Has unusual BI/DI, dual Tan and P (Pythagorean) scales, and 8 log log scales. Rule is self documenting on right hand side for all scales. A very powerful rule, physically oversized compared to most rules. (29 Scales! 10 cursor lines!) Front - LL00, LL01, LL02, LL03, A, [ B, BI, K, L, CI, C, ] D, LL3, LL2, LL1, LL0 Back - ST, T1, T2, DF, [ CF, S, CI, C, ] D, DI, P, S (+cos) |
Multilog 970 |
12"/10" Full Size Aristo Multilog Slide Rule. one of Aristo's high end professional rules, very popular in Europe, and made in many cosmetic variations, including metal end braces and all plastic construction. This particular 970 rule has an engineering pastic body, with filled and engraved black and red scales, with yellow accent stripes (a bit faded) on reference scales, plus scales are self-documenting on right hand side. Has the Rietz over-range scale extensions, plus anti-skid bottom bumpers, and 6 line cursor. Includes Log Log, folded and DI scales, chocolate bown leather case with front snap and BELT LOOP!. A classic Aristo design and beautifully thought out rule. (Incredible 24 Scales!) Front - LL00, K, A, [ B, T, ST, S, C, ] D, DI, LL0 Back - LL01, LL02, LL03, DF,[ CF, CIF, L, CI, C, ] D, LL3, LL2, LL1 |
Hyperbolog 0971  CLICK for BIGGER PIC
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CLICK for bigger PIC!13"/10.5" Hyperbolog Slide Rule Came complete in factory box with two part plastic hard case, manual, tilt stands, and accessory ruler strip. This example has the optional 6 line MAGNIFYING cursor, two color (red/black) scale markings with yellow accent stripes on body, DI, hyperbolic and log log scales. Rule is self documenting on right hand side for all scales, an has anti-skid bumpers on side frames to avoid cursor damage. Very unique solid plastic body rule with two part gray and white plastic case, with accessory tilt stands to make desk use easier with the magnifying cursor. (25 Scales !)Front - LL01, LL02, LL03, DF, [ CF, CIF, L, CI, C, ] D, LL3, LL2, LL1 Back - Th, K, A, [ B, T, ST, S, C, ] D, DI, Sh2, Sh1 |
Aristo Hyperlog 0972  CLICK for BIGGER PIC  CLICK for BIGGER PIC  CLICK for BIGGER PIC
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14 3/4"/10.5" Hyperlog Slide Rule Aristo's MOST MASSIVE and POWERFUL RULE, shown complete in factory box with two part plastic hard case, inspection certificate, manual (English), bag of tilt stands, and accessory ruler strip. Has a 10 line cursor, two color (red/black) scale markings with yellow accent stripes on body. Has P (Pythagorean scale), folded and expanded trig scales, and extensive hyperbolic and log log scales. Rule is self documenting on right hand side for all scales. Very unique solid plastic body rule with two part light and dark gray plastic case, with accessory tilt stands to make desk use easier, and avoid cursor scratches. Retail package includes instructions and factory box plus film strip accessory ruler that fits in a special case pocket. Very uncommon rule, and difficult to find, this is one of the last rules made by Aristo in 1972, to mark their 100th anniversary making slide rule, note the red 100th anniversary red package logo. (31 Scales !!) Front - LL00, LL01, LL02, LL03, DF, [ CF, CIF, L, CI, C, ] D, LL3, LL2, LL1, LL0 Back - H2, Sh2, Th, K, A, [ B, T, ST, S, P, C, ] D, DI, Ch, Sh1, H1 |
| Original Aristo Catalog Page for these rules (1969) |
60168  CLICK for BIGGER PIC
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6"/5" Circular Slide Rule Specialized rule for calculating steel rod weights in different cross-sections.
(See rule for details) |
80161  CLICK for BIGGER PIC
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6"/5" Optometrist's Slide Rule 14 cm Side ruler and 3 specialized scales.
(1 Ruler, 3 Scales) |
10096  CLICK for BIGGER PIC
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12"/10" System Peters Slide Rule Note the unusual DOUBLE LENGTH A/B and C/D scales, which provide on scale direct range to 10,000. Additional key numbers are also noted as gauge points along the top of the rule. (6 Scales) Front - Factors, A, [ B, C, ] D, L Back - blank |
10125  CLICK for BIGGER PIC
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6"/5" Galvanic Coating (plating) Slide Rule Deals with plating in material from Zinc to Gold. Very unusual cursor/body lubber lines design. (2 Rulers, 17 Scales) Front - cm ruler, A, [ B, F, C, ] D, in ruler Back - 12 specialized plating scales |
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