Coleman Model 3 pH Electrometer

Electrometer

Accession Number: 2003.185.59

Description: Device used for measuring the pH of solutions. Features include: a Coleman impulse amplifier circuit, an electronic amplifier, a precision-wound potentiometer, and a Weston type standard cell. Electrometer is enclosed in a wooden case with a hinged lid and a leather handle attached to the top of the lid. On the front is a metal fastener of which the bottom half is missing. A hinged door on the left side is secured shut with 4 screws and allows access to two tubes. Manufacturer's directions for using the device are printed on laminated paper and attached to the inside of the lid. A typewritten paper label with the name of the device is glued to the front of the case. "Inst. no. 2958" and "Model 3 D" --manufacturer's metal label on top of electrometer. This item was used at the Kentucky School for the Blind.

Height: 9.5

Width: 12

Depth: 7.5

Date Made: ca. 1940

Place of Origin: Maywood, IL

Collection: KSB Collection

History/Provenance: KSB Collection

Credit Line: Gift of the Kentucky School for the Blind, 2003.185

Subjects: Chemistry. Instructional aids, tools, and supplies. Science.

Dimension Notes: overall

Made: Coleman Electric Co.

Material: Wood, metal plastic, glass, leather, rubber

Updated: 05/21/2010