Slide rules HOME page | COLLECTION | NON-STANDARD RULES |
Make | Carbic (Otis King), London, England |
Model | Model L, Serial number R1942 Model K, Serial number W7400 |
Notes 1. The spiral scales gave the equivalent of a slide rule 66" long. 2. There are two different models. Model K (the upper image) has two scales for multiplication and division, which reduces the amount of manipulation required during calculations. Model L (the lower image) replaces one of these with a scale of logarithms, which extends the functionality of the rule. 3. A copy of the instructions, covering both models, can be found here. 4. Dick Lyon has a web site devoted to Otis King rules and is always pleased collect information from owners and give advice. |
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Model K |
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Model L |
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Close-up - Model K |
Close-up - Model L |
Manufacturing date | Model K, mid 1960s (email from Dick Lyon) Model L, 1955 (pencilled note inside of box) |
Length | Cylindrical |
Material | Chrome and black metallic. |
Scales | Two spiral scales the equivalent of C and D and one the equivalent of L. |
Gauge points | None |
Cursor | |
Hair lines | |
Documentation | Original documentation came with one of the rules. |
Condition | Both very good with original cardboard box.. |