Slide rules HOME page COLLECTION 10" RULES UNITED KINGDOM
Make Unique, UK
Model Electrical
Notes
1. This rule was intended for electrical calculations. It has two scales of temperature, used to calculate the variation in electrical resistance with temperature. Apart from that the scales are standard and the "electrical" comes from the special gauge marks.
2. It is also interesting to look at the image above where the labels, to the left, appear to have been scratched on by hand. However in the book "Teach Yourself the Slide Rule", whose author was associated with the Unique company, the diagrams also show crudely written labels!
3.  Instructions for use can be found here.
Front view
1012-unique-elect-01.jpg (23725 bytes)
Detail - left front view
1012-unique-elect-02.jpg (17029 bytes)		 Detail - temperature scales and gauge marks
1012-unique-elect-03.jpg (22007 bytes)
Tables on reverse of rule
1012-unique-elect-04.jpg (25632 bytes)		  
Manufacturing date c 1960
Length 10"
Material Celluloid on wood
Scales L2,scale of temperature in Fahrenheit,DF [CF,CI,C] D,scale of temperature of Centigrade,LL3
Note: Unique labels them as:
LU,FAHR,d,[c,no label,C},D,CENT,LL
Gauge points p: DF ,CF,C, D
V: DF (reciprocal of conductivity of copper)
W:(746) CF, DF, C, D
Note: For explanation on non-standard gauges marks see instructions.
Cursor Single line
Hair lines None