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 The Blundell-Harling Company Archive | ||||
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| Sphere Research Corporation 3394 Sunnyside Rd. West Kelowna, BC, Canada V1Z 2V4 Phone: +1 (250) 769-1834 FAX:+1 (250) 769-4106 A great source for test equipment, repairs, calibrations, useful metrology information, and of course, SLIDE RULES! 
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 Blundell-Harling Ltd. B.R.L BLUNDELL RULES LIMITED   Skip the INTRO, Go RIGHT to the Archive!
The various incarnations of Blundell Rules Limited (BRL) originated in Luton in the UK as an effort to create ongoing post-war work for a machine shop created during WW2. They later moved to Weymouth in the UK in January of 1956 and refined their rule making techniques, with the British government as a prime customer. In January of 1964, BRL purchased the assets of W.H. Harling Limited of Clapton, London, and with it, a line of precision drawing instruments, T-squares and related items (Harling had previously made wooden slide rules, but dropped them in favor of its other instruments). The resulting company became Blundell-Harling, and stayed in Weymouth. The 1970's saw the decline of slide rule revenues, and the company, like many others, focused on other areas including various metric converters to aid in the national change to the metric system, boat navigation aids (still in production) and drafting and drawing materials. Some perrygrafs, slide charts, specialty slide rules and special graphical calculator designs are still made for the government, medical and industrial customers, and the company still exists and is operating today in the UK. Unlike other makers, BRL or BH focused mainly on synthetic materials construction right from the beginning, starting with Bakelite, then moving quickly to plastic (PVC-Polyvinyl Chloride) rule construction (US Geon and German Astralon, then Cobex and Darvic). There are a few early metal framed glass cursors, but most are made from Acrylic materials. Early rules are marked B.R.L for Blundell Rules Limited.Later rules are marked BLUNDELL. Their rules, even early ones, are very distinctive in design, and have some strong visual features like the bright yellow accent stripes on the 800 series. They also produced a rule of considerable interest to collectors, the elusive and seldom seen 'Pilot Balloon Rule'. This large rule has a very unique assortment of scales and cursors to compute the flight behavior of atmospheric 'pilot' balloons for the British government's weather services. From the name, I first thought it was an ancient rule for navigating a lighter-than-air ship, imagine my disappointment....plotting un-manned weather balloons. Sigh. Special THANKS to Ray Hems for the original catalog data, and to the Oughtred Society Journal (Spring 1998) article by Peter Soole for historical information on Blundell.Want to visit Blundell-Harling today? Just click on the link below:  Click to visit Blundell Harling Today The ARCHIVE will appear below shortly! |
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JUST SCROLL DOWN TO SEE EVERYTHING !ORIGINAL Blundell-Harling Catalog Pages:
CLICK IMAGE TO ENLARGE
| Rulers and Scales |
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| Rulers and Scales |
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| Rulers and Scales |
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| Slide Rules |
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| Slide Rules and Charts |
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B.R.L
Blundell Rules Ltd.
Military Rules
Blundell Rules Ltd. Radiac No. 1 6665-110060 6665-110117  |
Radiation Effects Rule Radiac No. 1
The set includes the rule with changeable disks, and the carry pouch, both are new, perfect condition. Full instructions are on the rule reverse side. Interestingly, while it allows you to elegantly compute your radiatioon dosage, it does not say how much is fatal. An unfortunate oversight, if you should happen to really need this rule. |  CLICK for bigger PIC!  CLICK for bigger PIC! |
B.R.L
Blundell Rules Ltd.
Commercial Rules
| Blundell Rule Limited Model Number | Slide Rule Type | Size, Core Material | Scales Features | IMAGE LINKS (Browser Back to Return) |
| 604
| Electro | 5"
White Plastic | Inch ruler UL, A, [ B, CI, C, ] D, LL unknown Simple Simplex indicator, Leather slip case | 
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| 606
| Basic | 5"
White Plastic | Inch ruler A, [ B, CI, C, ] D unknown Simple Simplex indicator, Leather slip case | 
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| AL6
| AL6 | 10"
White Plastic | Inch ruler UL, A, [ B, R, C, ] D, LL [ S, ST, T ] cm ruler 3-Line Simplex indicator, metal framed, 2 rear stationary cursor lines Black fabric covered hinged 2-part wood case | 
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| P.17
| P.17 | 5"
White Plastic | Inch ruler UL, A, [ B, R, C, ] D, LL [ S, ST, T ] cm ruler Simple Simplex indicator, metal framed, 2 rear stationary cursor lines Leather slip case | 
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Blundell Harling Ltd. Rules
Commercial Rules
| Blundell-Harling Model Number | Slide Rule Type | Size, Core Material | Scales Features | IMAGE LINKS (Browser Back to Return) |
| 800
| Basic | 10"
White Plastic, yellow highlights | A, [ B, C, ] D -BLANK- Simple Simplex indicator 2-Part Blue Plastic Case | 
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| 803
| Rietz | 10"
White Plastic, yellow highlights | L, K, A, [ B, CI, C, ] D, S, T, ST -BLANK- 3-Line Simplex indicator 2-Part Blue Plastic Case | 
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| 804
| Darmstadt | 10"
White Plastic, yellow highlights | L, K, A, [ B, CI, C, ] D, P, S, T [ LL1, LL2, LL3 ] 4-Line Simplex indicator, 2 stationary rear cursor lines. 2-Part Blue Plastic Case | 
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| 808
| Accounting | 10"
White Plastic, yellow highlights | S, LL1, DF, [ CF, Uplift/Discount%, C, ] D, LL3, LL2 Month, [ Day, Week ] Simple Simplex indicator. 2-Part Blue Plastic Case | 
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| 813
| Rietz Classmate |
10"
White Plastic | S, T, A, [ B, CI, C, ] D, K, L 3-Line Simplex indicator. 2-Part Blue Plastic Case | 
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| 904
| Academy Duplex | 10"
White Plastic | ST, A, [ B, CI, C, ] D, S, T K, L, DF, [ CF, CIF, C, ] D, LL2, L3 1/3-Line Duplex indicator. Vinyl Slip Case | 
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| 905
| Academy Duplex | 10"
White Plastic | LL01, LL02, Ll03, A, [ B, L, CI, C, ] D, LL3, LL2, LL1 K, P, ST, DF, [ CF, CIF, CI, C, ] D, T, S 1/3-Line Duplex indicator. 2-Part Blue Plastic Case | 
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| Pilot Balloon Rule
| Mark 5 | 24"
White Plastic | Log, Cosine, Sine, Azimuth, [ Graticule (2) ] Elevation-Secant, Tangent -Blank- 4 Simplex indicators Finished wooden hinged 2-part case | 
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| S143-10
| S143-10 | 10"
White Plastic | K, A, [ B, CI, C, ] D, L -Blank- 3-Line Simplex indicator Vinyl bag + short form instructions | 
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| S150-10
| S150-10 | 10"
White Plastic | S, T, A, [ B, CI, C, ] D, K, L -Blank- 3-Line Simplex indicator Vinyl bag + short form instructions | 
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| S150-20
| S150-20 | 5"
White Plastic | S, T, A, [ B, CI, C, ] D, K, L -Blank- 3-Line Simplex indicator Vinyl bag + short form instructions | 
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| Later 0400 Catalog Numbers CLICK IMAGE to enlarge | |
| Rulers and Slide Rules |
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Missing Images Do you have one of the rules we have no data or pictures for? Please EMAIL it to us so we can include it.
Many thanks, 
Walter Shawlee 2.
