Smithsonian - National Museum of American History, Behring Center

 
Physical Sciences Collection - Surveying and Geodesy

Browse Makers | Browse Instruments | Index

Back
 

Transit - click to enlarge

Transit - click to enlarge

Click photos to enlarge.

Transit

Catalogue number:
1988.0154.01

Inscriptions:
"Buff & Buff Mfg. Co. Boston 8215" and "PAT'D NOV. 13-1900" and "Public Service Railway Co."

Dimensions:
height 14 inches; horizontal circle 6.25 inches; needle 4.25 inches; vertical circle 5-inch diameter; telescope 12 inches long; hanging level 6 inches

Discussion:
This transit is similar, in all important respects, to the instrument that George L. Buff designed in 1866, and that Buff & Berger began making in 1871. Buff & Buff continued the tradition, boasting that this instrument "is not the product of today nor of a few years, but the crowning result of over forty years' experience in dealing with a very critical clientele." A Precise Transit No. 1C cost $234 in 1907, and was still being offered in 1938. This example belonged to the New Jersey Transit Bus Operations, Inc.

The horizontal and vertical circles are silvered, graduated to 30 minutes of arc, and read by verniers to single minutes. There is a clamp and tangent to the telescope axis. The finish, termed Golden Bronze, was described in 1938 as "unique and characteristic" of Buff instruments. "It is not glaring, but is bright enough to throw off all objectionable heat rays."

Ref: Buff & Buff Mfg. Co., High Grade Engineering, Surveying, Astronomical and Mining Instruments (Boston, 1907), pp. 7, 28 and 36-41.

Buff & Buff Mfg. Co., Surveying Instruments for Civil and Mining Engineers (Boston, 1938), pp. 6, 15, 39 and 41-45.

Further Information:

Buff & Berger
Transit
Buff

Back