Circular Slide Rule Operating Information

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Circular Slide Rule
Operating Instructions

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Circular rules work on the same logarithmic concepts as straight rules, but the actual physical operation is sometimes not so simple to understand due to the construction. To help you puzzle out these rules, we are posting the original manuals here as we find them.

Circular rules were made by Concise, Faber-Castell, Pickett, Gilson, Fearns and others. Each maker had their own scale techniques and different construction methods. Some used rotating disks, some single, some dual cursor arms with clutches, and they existed both as simplex and duplex designs. Because of the different construction methods, each rule's operation is slightly different, and needs a bit of explanation as a result.

This information was freely distributed with new rules, but note that it is copyright by the repective companies.

OPERATING INFORMATION:

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SLIDE RULE

INFO / SCALES

Faber-Castell
Circular
8/10

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Circular Slide Rule
Uncommon Faber-Castell circular, plastic body rule with rotating scale and 7 line cursor, two color (red/black) scale markings, trademark mint green accent stripes on primary scales, yellow stripes on dual cycle scales, and expanded trig scales. The rule is self documenting on right hand side for all scales. An exceptionally high quality and attractive circular rule, seldom seen. The reverse side is blank.
(11 Scales)
Front - K, A, L, D, C, CI, D, T1, T2, S, ST

CLICK on the image below to see the manual page.

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