General Information

Serial #

N/A

Part Number

1

Total Parts

2

AKA

N/A

Patents

N/A

General Description

coated cardboard with metal grommets

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length

22.0 cm

Width

9.0 cm

Height

N/A

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Mathematics

Category

Calculating devices

Sub-Category

N/A

Manufacturer

AKA

Perrygraf

Country

United States of America

State/Province

Illinois

City

Maywood

Context

Country

Canada

State/Province

Unknown

Period

after 1942+

Canada

An American made manual calculating device used by a Canadian electronics engineer in the course of his work. The previous owner of this calculating device was Mr. Bob Bennett, who was born in 1920 in Fort William, Ontario. He attended McGill University, graduating in 1942 with a degree in electrical engineering. During WWII he was in the Signal Corps, stationed in Ottawa from 1942-1946, and was involved in radio design and development. In 1946 Mr. Bennett joined the Canadian Pacific Railway but rejoined the Army in 1947 and remained until 1960 working in radio telecommunication research and development. From 1960 to 1979 Mr. Bennett worked in the Public Service in electronics and telecommunication engineering, largely with D&D.

Function

This aid allows the user to solve "resonant frequency, capacitive reactance, inductive reactance, coil 'Q' an dissipation factor problems that cover a frequency range from 5 cycles per second to to 10000 megacycles".

Technical

An example of a specialized slide rule made by Perry Graf Corp. but distributed as a promotional item by Shure Brothers. The ability to do quick calculations is always useful. The ability to advertise in a manner that the client will continue to see a company name is considered effective. Placing a company name on a functional item like a slide rule achieves both aims. Shure Bothers manufactured and designed microphones, pickups, cartridges and the like.

Area Notes

Unknown

Details

Markings

black and white lettering in one side reads 'SHURE BROTHERS, INC. Reactance Slide Rule [script]/ USE THIS SIDE FOR CALCULATION OF RESONANT FREQUENCY PROBLEMS', 'SHURE/ MICROPHONES [logo]', 'Designers and Manufacturers of Microphones/ and Acoustic Devices', and 'SHURE BROTHERS, INC. 225 WEST HURON STREET, CHICAGO, U.S.A.' with black markings and instructions/ black lettering on the other side reads in part 'CAPACITIVE/ REACTANCE' and 'INDUCTIVE/ REACTANCE' with logos reading 'SHURE/ MICROPHONES' and black markings and instructions/ black lettering on slide reads ' Copyright 1942, Shure Brothers, Chicago, Ill./ Printed in United States of America/ Perry Graf Corp., Maywood, Ill.'

Missing

appears complete

Finish

teal blue, yellow, white and black finished cardboard/ plated metal

Decoration

N/A