Ruxton Multi-Vider pencil slide rule
Date: copyright 1928
Inventory Number: 1989-1-0015
Classification: Slide Rule
Dimensions:15.4 × 1.5 × 1.1 cm (6 1/16 × 9/16 × 7/16 in.)
Accessories: pencil lead; instruction booklet stored with DW0969
Description:
Mechanical pencil with metal point, end, and ball clip, and hexagonal black bakelite body in two parts. The half of the body to which the clip is attached slides away from the point.
The body is printed with four logarithmic scales carrying values 1 to 10. Call these scales A, B, C, and D, where A and B are visible with the clip on top and the point facing left; C and D are visible with the clip on bottom and the point facing left. Scale A has a "+" sign and an arrow pointing down in place of the left index. Scale B has a "-" sign to the right of the right index. Scale C has an arrow pointing down in place of the right index. Scale D has a "1" at both indices.