| This circular slide
rule was made for the Open University by Fearns
Calculators of Dunston, Gateshead. It was issued to
students on the second level course TM281 Modelling by
Mathematics. The C and D scales are 113 mm in diameter, giving them each a length of 355 mm (or 14 inches). In standard slide rule notation the scales on the front (from the outside inwards) are D [C B] A S T. These designations are not used, but instead the following labels are used. Basic scale Click on the thumbnails at right to see the full-size images. |
 front (201 kB) |
|
 back (69 kB) |