"Edmund Draper was born in Philadelphia in 1805 and died there in 1882. The Philadelphia City directories show as follows: 1833-37 Edmund Draper, instrument mf; 1837-38 Draper & Knox, Mathematical Instrument maker, Edmund Draper & Joseph Knox; 1852-82 Edmund Draper, mathematical & optical instrument maker.
In the Fifth edition of the catalog of Young & Sons dated April 1878 is the following paragraph: "About the same time (1830-1835) Mr. Edmund Draper constructed a graduating engine, which, amongst those acquainted with it, has a high reputation for accuracy."
He made the first distinctive mine transit about 1850.
There are various instruments bearing the name of Stancliffe & Draper. The Philadelphia City Directories do not list Edmund Draper and Benjamin Stancliffe as partners but it is assumed they may have been in partnership between 1830 and 1833."
Reference: Smart, Charles E. The Makers Of Surveying Instruments In America Since 1700 Troy, New York: Regal Art Press. 1962
Instrument shown is from the collection of the National Museum of American History, a division of the Smithsonian Institution