Make |
Thornton, United Kingdom |
Model |
PIC 131 |
Notes 1. This is an electrical rule with scales for volts and for the
efficiency of dynamos and motors in the well on the stock.
2. The rule is very similar to the PIC 121 and has all the scales in the same layout as
that rule. The additions are the scales in the well of the stock, the naming of the A and
B scales as "10 amps" and "10 yd. - .01 Sq. In" and the modification
of the slide with a Perspex tongue added.
3. This rule is a successor to the PIC 4866 electrical rule but has a number of
differences including the Perspex tongue rather than metal tongue for use with the
scales in the well and the use of the patented differential trig scale arrangement rather
than "traditional " trig scales on the back of the slide of the 4866.
4. Both this rule and the 4866 do have the patented differential log-log scales for values
close to 1.00. |
Front view
![1083-thornton131-01.jpg (25415 bytes)](1083-thornton131-01.jpg) |
Detail - front left
![1083-thornton131-02.jpg (27129 bytes)](1083-thornton131-02.jpg) |
Detail - front right
![1083-thornton131-03.jpg (22640 bytes)](1083-thornton131-03.jpg) |
Detail - scales in well of stock
![1083-thornton131-04.jpg (16201 bytes)](1083-thornton131-04.jpg)
|
Manufacturing date |
c 1970 |
Length |
10" |
Material |
Plastic |
Scales |
A, DF [CF, CI, C / S, L, T] {Efficiency,Volts},D, K |
Cursor |
Plastic - three hair lines |