Object Details
- Description (Brief)
- Celluloid, circular slide rule for determining elevation measurements to be used with transit telescopes. It is a flat, square panel with dial attached over the center. An image of a telescope appears in black and white on the reverse. It is an advertisement for W. & L. E. Gurley, "Makers of Civil Engineers and Surveyors Instruments," a company established in 1845.
- Location
- Currently not on view
- Data Source
- National Museum of American History
- advertiser
- W. & L. E. Gurley
- maker
- Whitehead & Hoag Company
- date made
- after 1899
- Physical Description
- cellulose nitrate (overall material)
- Measurements
- overall: 15 cm x 15 cm; 5 7/8 in x 5 7/8 in
- overall: 1/16 in x 5 13/16 in x 5 13/16 in; .15875 cm x 14.76375 cm x 14.76375 cm
- Object Name
- calculating rule
