Kegelman Instruction Manual for Engineers Transit

Description
This 20-page booklet was received with 2001.0282.01. Surveyors used stadia computers to reduce the data they collected from making observations with a transit and a stadia rod, to determine the vertical angle of elevation and the horizontal distance of the stadia rod.
William Kegelman, who manufactured transits with his brother and partner, George, from about 1944 to 1988, copyrighted a "stadia reduction computer" in 1956. This device is described on pages 9–10 of the booklet; the booklet's citation information is Kegelman Bros., Instruction Manual for Engineers Transit (Hunting[d]on Valley, Pa., 1957).
Reference: Robert C. Miller, "George Kegelman and Kegelman Brothers: Mathematical and Optical Instrument Makers," Rittenhouse 5 (1991): 56–58.
Location
Currently not on view
Object Name
documentation
documentation, slide rule
copyright date; date made
1957
maker
Kegelman Bros.
Physical Description
paper (overall material)
Measurements
overall: 18 cm x 12.8 cm; 7 3/32 in x 5 1/32 in
place made
United States: Pennsylvania, Huntingdon Valley
ID Number
2001.0282.02
accession number
2001.0282
catalog number
2001.0282.02
subject
Science & Mathematics
Mathematics
Rule, Calculating
Surveying
Slide Rules
See more items in
Medicine and Science: Mathematics
Slide Rules
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of Robert C. Miller
Additional Media

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