(See also, Frye, Joseph, manuscript booklet of "Tables Useful 

 for Surveying Land ..." 



Hagger, William Guyse (C. 1748 ?-1 830?), Newport, R.I. 

 Backstaff, or Davis Quadrant, about 1760-1770, made of dark wood 

 with scales and sights of boxwood, 25 in. long, 14 in. wide at large 

 arc and 5 in. wide at small arc. Inscribed as follows: "W™ G. 



Hagger Newp^ R. Island/ For M'" ." The name of the original 



owner has been blocked out by the insertion of a piece of ivory. 

 This quadrant was acquired from Mrs. Carola Paine of Bethel, 

 Conn., in 1961. USNM 319029. Figure 59. 



Davis quadrants signed by Hagger are in the Comstock Me- 

 morial Collection of the Rhode Island Historical Society "(dated 

 1776); in the Shepley Library in Providence, R.I. (dated 1768); 

 and in the Peabody Museum at Salem, Mass. (dated 1775). 



Also in the U.S. National Museum is an unsigned quadrant 

 (USNM 178975) that is almost identical in detail to the one signed 

 by Hagger. It is the gift of A. R. Crittenden, Middletown, Conn. 

 Another almost identical instrument, in the collection of the Frank- 

 lin Institute, is signed "C. Elliott, New London, 1764"; it differs 

 from the other two only in that a lens is combined in the middle 

 sight. 



HOLBECHER, JOHN, (fl. 1738). 



Backstaf, or Davis Quadrant, of dark wood with boxwood scales and 

 vanes. Length 25/2 in.; large arc 15 in. Inscribed "Made by 

 John Holbecher/ For Capt. Joseph Swan — 1738." 



Holbecher is not listed as an English or American instrument 

 maker, but it is believed that the instrument is American. 



Acquired from Bern C. Ritchie & Co., Chicago, 111., in 1960. 

 USNM 318439. 



Johnson, John, Surveyor, 1818. 



(See Rittenhouse & Evans, surveying compass.) 



Jones, W. & S., 135 Holborn, London. 

 (See Ellicott, Andrew, telescope.) 



Pierce, Abner (c. 1790). 



Surveying Compass with Jacob's staff. Made of brass; 12 in. long; 

 5 in. in diameter; with needle lift. Jacob's staff 4 ft. high and with 

 wood shaft about I/2 in.; brass head. Unsigned. Used about 

 1790 by Abner Pierce, who built Pierce's Mill in Rock Creek, 

 District of Columbia. 



139 



