AN EARLY 20TH CENTURY HANNYNGTON PATTERN GRID-IRON SLIDE RULE BY ASTON AND MANDER, LONDON with fifteen boxwood scales secured to removable ebonised base and eight interchangeable sliding scales inscribed on the back Designed by Major General Hannyngton, Aston and Mander & Co., London -- 33 x 9in. (84 x 23cm.)
AN EARLY 20TH CENTURY HANNYNGTON PATTERN GRID-IRON SLIDE RULE BY ASTON AND MANDER, LONDON with fifteen boxwood scales secured to removable ebonised base and eight interchangeable sliding scales inscribed on the back Designed by Major General Hannyngton, Aston and Mander & Co., London -- 33 x 9in. (84 x 23cm.)
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