1899 Cox\'s Stadia Computer Difference Of Elevation Circular Slide Rule For Sale
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1899 Cox\'s Stadia Computer Difference Of Elevation Circular Slide Rule:
$99.99
Made by Whitehead & HoagCelluloid, 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.DATE MADEafter 1899ADVERTISERW. & L. E. GurleyMAKERWhitehead & Hoag CompanyPLACE MADEUnited States: New Jersey, NewarkREFERENCEDUnited States: New York, TroyPHYSICAL DESCRIPTIONcellulose nitrate (overall material)MEASUREMENTSoverall: 15 cm x 15 cm; 5 7/8 in x 5 7/8 inoverall: 1/16 in x 5 13/16 in x 5 13/16 in;.15875 cm x 14.76375 cm x 14.76375 cm
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