Perrygraf Metalcutting Slide Rule for Dreis & Krump
date: label: date made
content: 1944
name: label: maker
content: Perry Graf Corporation
notes: label: Description
content: The Chicago firm of Dreis & Krump distributed this yellow paper slide rule as an aid to those using the machine tools it manufactured to cut, bend, and punch sheet steel and brass. The rule has a paper slide and is held together with metal rivets. The front of the instrument and slide combine to produce a table for determining the length of sheet steel required, assuming the piece has various numbers and shapes of bends. The reverse has a rule for calculating tons pressure per lineal foot, given the gauge of the metal and the width of the female die opening desired. The back also has a rule for calculating the tons of pressure needed for punching three types of metal, given the gauge of the metal and the diameter of the hole.
label: Description
content: The front is marked: DREIS & KRUMP (/) MANUFACTURING COMPANY (/) Mfrs. of CHICAGO STEEL PRESS BRAKES. The right side has a logo with the letters D&K in a diamond; the company stopped using this logo by about 1960. On the back, the left side is marked: DREIS & KRUMP (/) MFG. CO., (/) CHICAGO 36. The lower right corner is marked: Copyright 1944, Perry Graf Corp., Maywood, Ill.
label: Description
content: Dreis & Krump was one of many businesses that turned to Perrygraf (or Perry Graf) Corporation for promotional slide rules and charts. In 1934, machinery inspector Lester E. Perry (1901–1991) came up with the idea of equipping salespeople with slide charts so that they could immediately answer customers' questions. Perrygraf Corporation, the company he established in the Chicago, Ill., suburbs, quickly became a dominant force in this market.
label: Description
content: References: Walter Shawlee II, "The Wonderful World of Slide Charts, Wheel Charts, and Perrygrafs," Sphere Research Corp., http://sphere.bc.ca/test/perrygraf.html; "People: Perrygraf," <i>Waywiser</i>, Harvard University Department of the History of Science website.
label: Location
content: Currently not on view
topic: label: Subject
content: Mathematics
label: Subject
content: Rule, Calculating
label: Subject
content: Manufacturing
setName: label: See more items in
content: Medicine and Science: Mathematics
label: See more items in
content: Science & Mathematics
label: See more items in
content: Slide Rules
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1988.0325.01
label: accession number
content: 1988.0325
label: catalog number
content: 1988.0325.01
objectType: label: Object Name
content: slide rule
physicalDescription: label: Physical Description
content: paper (overall material)
label: Physical Description
content: metal (part material)
label: Measurements
content: overall: .2 cm x 22.9 cm x 10.2 cm; 3/32 in x 9 1/32 in x 4 1/32 in