Altitude and Azimuth Instrument
name: label: maker
content: H. Morin
notes: label: Description
content: This instrument and its mate would have been used, at either end of a base line, to observe air borne objects, primarily for military or meteorological purposes. The Signal Corps of the U. S. Army acquired the pair around the time of World War I, and transferred them to the Smithsonian in 1923.
label: Description
content: The beveled edge of the horizontal circle is graduated metrically to 400 grads, and read by opposite verniers to 1/20th of a degree. The vertical circle is graduated and read in the same way. A smaller telescope is mounted below the baseplate. The primary telescope is "broken," and thus the eyepiece remains at the same height regardless of the elevation of the objective. H. Morin began in business in Paris in 1880, making a variety of mathematical instruments. The firm was still in business in 1954.
label: Location
content: Currently not on view
place: label: place made
content: France: Île-de-France, Paris
setName: label: See more items in
content: Medicine and Science: Physical Sciences
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content: Surveying and Geodesy
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content: Measuring & Mapping
creditLine: label: Credit Line
content: War Department, Signal Corps, Meteorological Section
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: PH.308185.01
label: catalog number
content: 308185.01
label: accession number
content: 70852
objectType: label: Object Name
content: altitude and azimuth instrument
label: Object Name
content: theodolite
physicalDescription: label: Measurements
content: horizontal circle: 6 1/4 in; 15.875 cm
label: Measurements
content: vertical circle: 5 1/2 in; 13.97 cm
label: Measurements
content: telescope objective aperture: 1 1/2 in; 3.81 cm
label: Measurements
content: overall: 11 1/2 in x 12 5/8 in x 7 3/4 in; 29.21 cm x 32.0675 cm x 19.685 cm