Artifact Details

Title

The Adder calculator

Catalog Number

B1636.01

Type

Physical object

Date

1891

Manufacturer

C. H. Webb

Identifying Numbers

Other number 4051 stamped on bottom of unit

Dimensions

1/4 x 6 1/4 x 4 1/4 in.

Description

The Adder Calculator consists of two interlocking metal dials, one small and one large etched with numbers around rotating internal components. There is a small open window where the two dials meet. The smaller side includes text "PATD NOV 5TH 12TH 1889". Text on the larger dial reads "The Adder" and "C.H. WEBB". There are five small to large rust spots on the back around the center opening of the smaller dial.

Category

Calculator: mechanical

Collection Title

Gwen Bell artifact and book collection

Series Title

Pre-computing artifacts

Lot Number

B1636.01