Details

A-225

Slide Rule: Spiral, Calculator

Spiral brass slide rule. Side (a) for addition and subtraction. Side (b) for multiplication and division. Manuscript instructions from the maker. Original fitted case.

"Venetijs-1714/Bernardus Facini/suo Marte ft."

brass, cardboard, leather, velvet, paper

Italy

	Imperial(in)		Metric(cm)
Height			12.9
Width			11.8
Depth			0.5
Diameter
Circumference

	Imperial(in)		Metric(cm)
Height	5 5/16		13.4
Width	5 6/16		13.6
Depth	5 6/16		13.6
Diameter	5 6/16		13.6