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Slide Rule (Main) 
When I was a student, I used a slide rule for most of calculations. And I used a 7 digit (?) Logarithmic table if I wanted better accuracy.
Electronic calculators were developed in early 1970s, and, especially after introduction of "scientific calculators", slide rules disappeared very quickly.
Trivia: Most of the slide rules come in 4, 5, 10 inches. The length refers to the actual scale length, not overall length of the rule. Also, scale lengths are in metric. So, a "10 inch" rule has the scale length of 25.0cm exactly. Please visit Slide Rule Annex for my complete SR collection and more detailed discussions on slide rules.  10 Inch rules (below)  Pocket Size Rules  Circular Rules  Special Rules   Links  Slide Rule Annex (My collection and SR related subjects)  

Standard size: 10" rules (Click images to view details.) 

Faber Castell 2/83N Novo Biplex 
Farber Castell's late model. This model is regarded as the ultimate slide rule and has most of the scales ever invented. This is "a big brother" to the 5inch model 62/83N, which has the same set of scales as this model. 

Hemmi 250 General Purpose 
A duplex for general use. Bamboo body with celluloid. ; Front scales are DF [CF, CIF, CI, C] D, L. Back scales are K, A [B, TI2, TI1, SI] D, DI. It has total of 15 scales. DF, CF scales are folded at srt(10), rather than pi. I bought this rule at a store in 2000. 

Hemmi 256 Communication 
Designed for communications engineering, this rule has a special set of scales for calculating the resonant frequency of a coil and a capacitor. An ingenious system of keeping track of decimal positions is implemented. 

Hemmi 259D Mechanical Engineering 
A duplex for general use. Bamboo body with celluloid. Front scales are; LL/1, LL/2, LL/3, DF [CF, CIF, CI, C] D, LL3, LL2, LL1. Back scales are L, K, A [B, T, S, ST, C] D, DI, LL0, LL/0. It has total of 24 scales. 

Keuffel & Esser 40533 Polyphase 
Keuffer & Esser's early slide rule (1920s?). Made with mahogany body. 

Keuffel & Esser 681497 Polyphase Duplex Decitrig 
Made with mahogany core with celluloid. For decorative purpose, only part of sides is covered with celluloid so that wood is visible at front and rear sides. I like the design. 

Pickett N3T Power Log Exponential LogLog Dual Base 
One of the Pickett's most sophisticated slide rules. This model is in whiTe.


Post 1460 Versalog 
This bamboo rule out of Post is an OEM from Hemmi. Front scales include; LL0, LL/0, K, DF [CF, CIF, CI, C] D, R1, R2, L. Back scales are; LL/1, LL/2, LL/3, [T, T, SecT, ST, Cos, S, C] D, LL3, LL2, LL1. 

Ricoh 151 
This bamboo rule has 25 scales. Front; LL1, LL2, LL3, DF [CF, CIF, CI, C] D, LL3, LL2, LL1, and back; LL0, L, K, A [B, S, ST, T, C] D, DI, P, LL0. 

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