SLANDS i US.COAST SURVEY A D.BACHE Supdt. LINES OF EQUAL MAGNETIC DECLINATION FOR THE YEAR 1850 A Scale 20 000 000 1856. 104 75 er man Lat 70 Broadway NY TREATISE ON LAND-SURVEYING: COMPRISING THE THEORY DEVELOPED FROM FIVE ELEMENTARY PRINCIPLES; AND THE PRACTICE WITH THE CHAIN ALONE, THE COMPASS, THE TRANSIT, ILLUSTRATED BY FOUR HUNDRED ENGRAVINGS, BY W. M. GILLESPIE, LL. D., CIV. ENG., PROFESSOR OF CIVIL ENGINEERING IN UNION COLLEGE. FIFTH EDITION. NEW-YORK: D. APPLETON & CO. 346 & 348 BROADWAY, AND 16 LITTLE BRITAIN, LONDON. M DCCC LVII. |