Brass Eidograph and Planimeter, 19th and 20th century, eidograph with the center shaft engraved ruler divided 0-80, adjustable vernier, two 3 3/4-in. pulleys, one marked A, the other B, lead and brass-cased center weight, knurled wire adjustment screws and two arms each engraved with scales, planimeter by Keuffel & Esser, both in their original fitted boxes.
Brass Eidograph and Planimeter, 19th and 20th century, eidograph with the center shaft engraved ruler divided 0-80, adjustable vernier, two 3 3/4-in. pulleys, one marked A, the other B, lead and brass-cased center weight, knurled wire adjustment screws and two arms each engraved with scales, planimeter by Keuffel & Esser, both in their original fitted boxes.
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