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Handmade slide rule for fetal head circumference

Major collection: Science & Technology
Named collection: Keuffel & Esser Company Collection
Object type: slide rule
Maker: Materials: wood
Measurements: 1/4 in x 10 1/2 in x 1 in

Handwritten paper scales glued over existing rule marked "250 BT" on slide. On front: "Set arrow on proper object-film dist. & read result of middle scale below." On back: "Mean scalp circumference of fetal head [=skull circum. plus 2 cm] in cm]" against "age of fetus in weeks"


2004.010.0632

Keuffel & Esser Company Slide Rule Collection Donated by InteliCoat Technologies



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