A TREATISE ON THE PRINCIPAL MATHEMATICAL INSTRUMENTS EMPLOYED IN SURVEYING, LEVELLING, & ASTRONOMY, &c. &c. FREDERICK W. SIMMS, SURVEYOR & CIVIL ENGINEER, LATE OF THE ROYAL OBSERVATORY, GREENWICH, AND FORMERLY London: SOLD, FOR THE AUTHOR, BY MESSRS. TROUGHTON AND SIMMS, 136, FLEET STREET; J. WEALE, ARCHITECTURAL LIBRARY, 59, HIGH HOLBORN; AND J. SOUTER, 73, ST. PAUL'S CHURCH-YARD. |