Datalizer Energy Operating Cost Calculator for TVA
date: label: date made
content: 1990
name: label: maker
content: Datalizer Slide Charts, Incorporated
notes: label: Description
content: This rectangular white cardboard rule has four slides and is held together with ten metal rivets. The top two slides are used to calculate the annual operating cost of a natural gas furnace, while the bottom two slides perform the same calculation for an electric heat pump. Tables on the back of the instrument give values for building heat loss, typical heating system efficiencies, and heating load hours for the states covered by the Tennessee Valley Authority: Alabama, Georgia, Kentucky, Mississippi, North Carolina, and Tennessee. A sample calculation is also provided on the back.
label: Description
content: The front and back are both marked: <i>Electricity</i> (/) THE POWER (/) OF CHOICE. Both sides are also marked: TVA. The rule thus advertised TVA's ability to supply inexpensive public electric power and promote energy conservation. The back bottom left corner is marked: © 1990 Datalizer Slide Charts, Inc., Addison, IL 60101. A former employee of the Perrygraf (or Perry Graf) Corporation (see 1979.3074.03) established Datalizer around 1960, and the company remained in business as of 2012.
label: Description
content: References: "From the New Deal to a New Century," <i>Tennessee Valley Authority</i>, http://www.tva.com/abouttva/history.htm; "Slide Chart Specialists," <i>Datalizer Slide Charts</i>, http://www.datalizer.com/about-us/.
label: Location
content: Currently not on view
place: label: place made
content: United States: Illinois, Addison
topic: label: Subject
content: Mathematics
label: Subject
content: Rule, Calculating
label: Subject
content: electricity
label: Subject
content: Government
setName: label: See more items in
content: Medicine and Science: Mathematics
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content: Science & Mathematics
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content: Slide Rules
creditLine: label: Credit Line
content: Gift of Jack Warner
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1996.3078.02
label: nonaccession number
content: 1996.3078
label: catalog number
content: 1996.3078.02
objectType: label: Object Name
content: calculating rule
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 23.9 cm x 12.5 cm; 3/32 in x 9 13/32 in x 4 29/32 in