Queen Transit

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Queen introduced transit instruments of this form in the late 1880s, and kept them in production for about a decade. The "Queen & Co. Makers. Philada 5420" signature on this example was introduced in 1896.
The horizontal circle is graduated clockwise and counterclockwise, and read by opposite verniers to one minute. The vertical arc covers 150 degrees, and is read by vernier to one minute. The telescope has stadia wires for distance determination, and a clamp and tangent screw to the axis.
Ref: James W. Queen & Co., Catalogue of Mathematical and Engineering Instruments and Materials (Philadelphia, 1887), pp. 143-144.
Currently not on view
Queen and Company
overall: 13 in; 33.02 cm
horizontal circle: 6 1/2 in; 16.51 cm
vertical arc: 6 in; 15.24 cm
needle: 4 7/8 in; 12.3825 cm
telescope: 11 in; 27.94 cm
hanging level: 6 in; 15.24 cm
overall: 16 1/4 in x 15 1/8 in x 9 in; 41.275 cm x 38.4175 cm x 22.86 cm
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Surveying and Geodesy
Data Source
National Museum of American History


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