Instruction Manual for Pickett Slide Rules with Ln-L Scales
date: label: date made
content: after 1964
name: label: maker
content: Hartung, Maurice L.
notes: label: Description
content: Maurice Hartung of the University of Chicago wrote this sixteen-page booklet to explain the use of natural log and logarithmic scales placed on Pickett's line of "dual-base" slide rules. Its citation information is: Maurice L. Hartung, <i>How to Use Ln-L Scale Slide Rules</i> (Santa Barbara, Calif.: Pickett, Inc., n.d.). The logo and address on the cover were in use from 1964.
label: Description
content: Pickett used these scales on several models represented in the Smithsonian collections, including 3, 4, 515, 600, and 1010. The rules depicted in the booklet are models 1011 and 4, similar to 2000.0203.01. Hartung explains how to find logarithms and natural logs (by reading the mantissa), powers of <i>e</i> and 10, logarithms of proper fractions, powers for negative exponents, and the characteristic. He explains how to place the decimal point and how to correct for the error introduced when the number 2.3 is used to estimate <i>e</i>. He then covers multiplication, division, logarithms of combined operations, powers of other bases, hyperbolic functions, and applied problems.
label: Location
content: Currently not on view
place: label: place made
content: United States: Illinois, Chicago
topic: label: Subject
content: Mathematics
label: Subject
content: Rule, Calculating
setName: label: See more items in
content: Medicine and Science: Mathematics
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content: Science & Mathematics
creditLine: label: Credit Line
content: Gift of Terry M. Sachs
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1980.0097.04
label: accession number
content: 1980.0097
label: catalog number
content: 1980.0097.04
objectType: label: Object Name
content: pamphlet
physicalDescription: label: Physical Description
content: paper (overall material)
label: Measurements
content: overall: 21.1 cm x 13.7 cm x .1 cm; 8 5/16 in x 5 13/32 in x 1/32 in