[nb-NO]Details[nb-NO]

A-213

Mathematical

Slide Rule: Thacher's

Thacher's calculating instrument, with printed directions and rules for operating pasted to the upper surface of base. One of two wooden turning knobs is missing. A section of one of the feet on the bottom of the base is broken off.

"KEUFFEL & ESSER CO. N.Y."

On base: "4012" over "2562;" the maker's inscription stamp; and an eagle or hawk holding a circle in one claw, with "TRADEMARK."

Around one end of the drum: "Patented by Edwin Thacher, C. E. Nov. 1st, 1881." and "Made by Keuffel & Esser Co., New York."

c. 1910

wood, paper, brass

United States

	Imperial(in)		Metric(cm)
Height			14.1
Width			54.6
Depth			14.1
Diameter
Circumference

	Imperial(in)		Metric(cm)
Height
Width
Depth
Diameter