$1,169
A. M.L. Position Line Slide Rule Mark IIA, Air Ministry Laboratory, South Kensington, no. 118/36, the inner cylinder is graduated with log tangents, the outer scale is graduated with log cosines, rear of slide are given scales of dip, refraction, moon's parallax and converting time to arc, bone plaque engraved AM with a crown, ht. closed 9 in.; together with a Muto Giken "Kooler Calculator," 11 1/2-in. rule with clear rotational sleeve for reading the scale.
Auctioneer:
Skinner
Date:
2014-04-29