COLLECTION OF PHOTOGRAMMETRY & GEODETIC INSTRUMENTS: From the estate of Col. Louis H. Knipling Jr., doctor and professor of photogrammetry & geodesy, instruments to include 1) Bowen & Company drafting Protractor P-408-A in Army Corps of Engineers original case, 1 1/2'' x 14 1/4'' x 6''. 2) Unknown maker drafting protractor USCE case, 1'' x 14 1/4'' x 6 3/4''. 3) Haff drafting set, complete in blue plastic felt lined case, 1 1/2'' x 15 1/4'' x 7 3/4'' 4) Mirror stereoscope with presentation plaque to Col. Knipling on base, in original case, 6 1/2'' h. x 19'' x 7 1/2''. 5) Gordon Enterprises Parallax Bar in original case 2 3/4'' x 17'' x 5''. 6) Keuffel & Esser Leroy Lettering Set in original case, 1 3/4'' h. x 15 3/4'' x 4''.