Heller & Brightly Transit

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Description
Heller & Brightly advertised this as an "Improved Complete Combined Transit and Leveling Instrument For Civil Engineers and Surveyors." This example is marked "Heller & Brightly Makers 5740 Philadelphia." The serial number indicates that it was made around 1884. New, the basic transit cost $220. The vertical circle was an extra $25. The horizontal circle is silvered, graduated every 30 minutes of arc, and read by verniers at N and S to single minutes. There are level vials at N (this one covers a vernier) and at E. The vertical circle, also silvered, is read by vernier to single minutes, and is protected by an aluminum guard. To reduce weight, the vertical standards are ribbed and braced. The telescope is equipped with stadia wires for determining distances.
The tripod head of this transit allows the instrument to be leveled, and also to be adjusted horizontally in order to be brought over a fixed point on the ground. Daniel Hoffman obtained a patent (#197,369) on this design in 1877, and assigned the rights to Heller & Brightly in exchange for $5 for each unit sold.
Ref: Heller & Brightly, Remarks on Surveying Instruments (Philadelphia, 1886).
Location
Currently not on view
date made
ca 1884
maker
Heller & Brightly
place made
United States: Pennsylvania, Philadelphia
Measurements
overall: 15 1/2 in; 39.37 cm
horizontal circle: 7 1/2 in; 19.05 cm
vertical circle: 5 1/4 in; 13.335 cm
needle: 5 in; 12.7 cm
telescope: 11 1/4 in; 28.575 cm
hanging level: 6 in; 15.24 cm
overall: 18 1/8 in x 12 in x 9 1/2 in; 46.0375 cm x 30.48 cm x 24.13 cm
ID Number
PH.328726
catalog number
328726
accession number
275808
See more items in
Medicine and Science: Physical Sciences
Measuring & Mapping
Surveying and Geodesy
Data Source
National Museum of American History, Kenneth E. Behring Center

Comments

I own a Heller and Brightly also made in 1884Mine is serial no. 5712Mine is solid brassWhat is the difference between the black painted instruments and the solid brass ones?

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