Item HT 24908 Slide Rule - W.& G. Record Processing Co, 'Dualface' Comprehensive Model 432, Melbourne, Victoria, circa 1946

Summary

Slide Rule & Case used to calculate conversions between different scales of measurement on a linear scale. The scales of measurement include log-log (LL), log (L), A, B, C, D, Cu, sine, tangent, cosine, power, voltage drop and efficiency. The slide rule is stored in a cloth-lined cardboard storage case. Inscription name 'C.L. Rawling'.

The object was manufactured by White & Gillespie (W & G) Record Processing Co. Pty. Ltd. The company formed in 1910 as a printing business and began manufacturing drawing instruments after World War II.

Physical Description

The slide rule is made of laminated wood with various scales engraved in red and black into the laminate on two sides. Two pieces are fixed by screwed metal plates while the central piece can slide along the length and can be removed. There is a glass covered plate (cursor) in a metal holder with a marked line, which encloses the three pieces and can slide along its length. The storage case is made of heavy cardboard lined with a navy blue coloured cloth and has gold coloured embossed lettering of the maker's name and product identification. There is a name handwritten inside the case in black pen. One of the corners is damaged and the some of the cloth is peeling away from the cardboard surface along ove of the long edges. There is also a detached paper label that was once attached to one end of the case.