|Slide rules HOME page||COLLECTION||< SITE MAP >|
The advantage of these rules was that they could provide long scale lengths, and hence increased
accuracy, in a small space. Their disadvantage was that it was difficult to fit in a full range of scales.
|Circulator||None given||Made by a little known British manufacturer|
|Fearns||Circular slide rule||Has an interesting spiral log log scale|
|Concise||28N||Carries "Time Life books" logo||Original instructions.|
|Concise||4028||Another promotional rule from Concise|
|Concise||CTCS-552||Carries "Shell" logo.|
|Concise||300B||A duplex circular rule|
|Gilson||Midget||A rule with some good ideas and some strange scales||Instruction for drill and thread scales.|
|Gilson||Binary||A larger version of the above|
|Aristo||Nr 622||A fairly basic rule.|
|Graphoplex||Roplex||Scales are turned by knurled knobs.||Original instructions (in French).|
|Eckell||Dial-O-Matic||Very full selection of scales|
|ALRO||200R||Box doubles as desk stand for rule|
|Fearns||Trigonometrical||Sepcially for trigonometrical calculations||Original instructions|
Original instructions: scanned version of maker's original instructions
Full instructions: complete instructions based on book or similar.
Instructions: instructions based on my own research.
For some rules instructions are given for special scales only.