[nb-NO]Details[nb-NO]

A-321

Slide Rule: Mannheim-type

Cardboard case is gold-stamped. One end of case has been repaired with black tape. Rule with single slider. One slide-rule face and slider there are measurements pertaining to radius, the reverse side which can be read through a transparent plastic cursor (patent 2,086,502) which moves along grooves on the sides of instrument has trigonometric scales for sines, equal parts, and tangents.

"KEUFFEL & ESSER CO. N.Y. / PAT. JUNE 5, 1900 / MADE IN U.S.A. / <405 3- 5>"; Case is gold-stamped "KEUFFEL & ESSER Co./POLYPHASE/REG. U.S. PAT. OFF./SLIDE RULE."

wood, ivorine, cardboard

United States

	Imperial(in)		Metric(cm)
Height			1.6
Width			51.9
Depth			4
Diameter
Circumference

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