Cenco Gas Volume Reduction Circular Slide Rule
date: label: date made
content: after 1921
name: label: maker
content: Central Scientific Company
notes: label: Description
content: This yellow paper circular rule consists of two discs, one with a protruding tab for rotating the disc, held together with a metal grommet. The device reduces the observed volume of a gas to the corresponding volume under standard conditions (0°C, 760 mm pressure). Scales for temperatures from 10 degrees to 35 degrees centigrade and for pressures from 700 to 790 mm run along the lower edge of the rule. Setting the device for an observed temperature and pressure reveals a volume factor and the logarithm of the volume factor in the lower interior of the instrument. The factor is multiplied by the observed volume on the scale along the upper edge of the instrument to arrive at the reduced volume.
label: Description
content: The instrument is marked: CentralScientificCo. (/) CENCO (/) CHICAGO U.S.A. (/) GAS VOLUME REDUCTION CHART. It is also marked: Copyrighted 1921, by Central Scientific Co. An advertisement for the "new rotary CENCO hyvac pump," available from Central Scientific's <i>Bulletin No. 92</i>, appears on the back of the device. For another instrument made by Central Scientific Co., see 1982.0147.02.
label: Description
content: The front of the instrument indicates that Prof. E. M. Jones of Adrian College in Adrian, Mich., proposed its design. Jones also wrote "Laboratory Versus Recitation," <i>School Science and Mathematics</i> 8 (1923): 749–759. In 1920, he was appointed to the city of Adrian's first water board.
label: Description
content: Reference: "Adrian H<sub>2</sub>O: Over One Hundred Years," http://www.ci.adrian.mi.us/Services/Utilities/History.aspx.
label: Location
content: Currently not on view
place: label: place made
content: United States: Illinois, Chicago
topic: label: Subject
content: Rule, Calculating
label: Subject
content: Chemistry
label: Subject
content: Mathematics
label: Subject
content: Manufacturing
setName: label: See more items in
content: Medicine and Science: Mathematics
label: See more items in
content: Science & Mathematics
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content: Slide Rules
creditLine: label: Credit Line
content: Gift of Oscar W. Richards
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1979.3074.02
label: nonaccession number
content: 1979.3074
label: catalog number
content: 1979.3074.02
objectType: label: Object Name
content: calculating rule
label: Object Name
content: slide rule
physicalDescription: label: Physical Description
content: metal (part material)
label: Physical Description
content: paper (overall material)
label: Measurements
content: overall: 13.2 cm x 13.2 cm x .2 cm; 5 3/16 in x 5 3/16 in x 3/32 in