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