Kegelman Instruction Manual for Engineers Transit

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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
copyright date; date made
1957
maker
Kegelman Bros.
place made
United States: Pennsylvania, Huntingdon Valley
Physical Description
paper (overall material)
Measurements
overall: 18 cm x 12.8 cm; 7 3/32 in x 5 1/32 in
ID Number
2001.0282.02
accession number
2001.0282
catalog number
2001.0282.02
Credit Line
Gift of Robert C. Miller
subject
Mathematics
Rule, Calculating
Surveying
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Slide Rules
Data Source
National Museum of American History, Kenneth E. Behring Center

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