Arlton conversion rule circular slide rule
Date: copyright 1960
Inventory Number: 1998-1-1348
Classification: Slide Rule
Subject:
Maker: Arlton Workshop
Cultural Region:
Place of Origin:
Dimensions:
0.2 × 17 × 17 cm (1/16 × 6 11/16 × 6 11/16 in.)
Accessories: stored in plastic bag
DescriptionCircular slide rule made of plastic, composed of two white discs and a clear indicator (with a black indicating line) attached at the center with a brass fastener.
Three scales are printed around the circumference of the bottom, larger disc. Nearest the outside edge is an "L" scale carrying values from 0 to 1. Adjacent to this scale is a an inverted logarithmic scale "DI", with values descending (clockwise) from 10 to 1. Printed adjacent to the smaller disc is a logarithmic "D" scale, carrying values from 1 to 10.
Printed around the circumference of the larger disc between the "DI" and "D" scales are a series of unit ratios.
Six additional scales are printed around the circumference of the top, smaller disc. The outermost scale, labeled "C", is adjacent and identical to the larger disc's "D" scale. Inside this scale, stacked vertically, are two logarithmic "R" scales. The outermost "R" scale carries values from 1 to 3.16; the innermost "R" scale carries values from 3.16 to 10. Inside the "R" scales, stacked vertically, are three logarithmic "K" scales. The outermost "K" scale has values ranging from 1 to 2.15; the center scale has values ranging from 2.15 to 4.65; and the innermost "K" scale has values ranging from 4.65 to 10.
Between the "D" and "R" scales on the smaller disc is a slot through which two additional scales printed on the outermost disc are visible. The outermost scale, "S" or "SINE", has values ranging from 0 to 85. The innermost scale, "T" or "TAN", carries values from 0 to 45. Printed to the right of the slot are equations showing the relationship between sines, tans, and their inverses.
Instructions for the slide chart's use are printed in the center of the top, smaller disc. The back of the slide chart is printed with tables of equations.
Three scales are printed around the circumference of the bottom, larger disc. Nearest the outside edge is an "L" scale carrying values from 0 to 1. Adjacent to this scale is a an inverted logarithmic scale "DI", with values descending (clockwise) from 10 to 1. Printed adjacent to the smaller disc is a logarithmic "D" scale, carrying values from 1 to 10.
Printed around the circumference of the larger disc between the "DI" and "D" scales are a series of unit ratios.
Six additional scales are printed around the circumference of the top, smaller disc. The outermost scale, labeled "C", is adjacent and identical to the larger disc's "D" scale. Inside this scale, stacked vertically, are two logarithmic "R" scales. The outermost "R" scale carries values from 1 to 3.16; the innermost "R" scale carries values from 3.16 to 10. Inside the "R" scales, stacked vertically, are three logarithmic "K" scales. The outermost "K" scale has values ranging from 1 to 2.15; the center scale has values ranging from 2.15 to 4.65; and the innermost "K" scale has values ranging from 4.65 to 10.
Between the "D" and "R" scales on the smaller disc is a slot through which two additional scales printed on the outermost disc are visible. The outermost scale, "S" or "SINE", has values ranging from 0 to 85. The innermost scale, "T" or "TAN", carries values from 0 to 45. Printed to the right of the slot are equations showing the relationship between sines, tans, and their inverses.
Instructions for the slide chart's use are printed in the center of the top, smaller disc. The back of the slide chart is printed with tables of equations.
Signedface, top of top disc: the Arlton / Conversion Rule / A CIRCULAR LOGARITHMIC CALCULATOR;
face, bottom of top disc: © ARLTON WORKSHOP 1960 / [SA trademark] / ©1959;
bottom of back disc: ARLTON WORKSHOP / LENNOX, SD
face, bottom of top disc: © ARLTON WORKSHOP 1960 / [SA trademark] / ©1959;
bottom of back disc: ARLTON WORKSHOP / LENNOX, SD
FunctionFor performing unit conversions and solving mathematical problems, including multiplication, division, squares, cubes, square roots, cube roots, and trigonometrical problems.