PRINCIPAL CONTENTS: Part 1. Introduction and the Principles of Geometry. Part 2. Land Surveying; comprising General Observations--The Chain--Offsets Surveying by the Chain only--Surveying Hilly Ground--To Survey an Estate or Parish by the Chain only--Surveying with the Theodolite--Mining and Town Surveying--Railroad Surveying--Mapping--Division and Laying out of Land--Observations on Enclosures--Plane Trigonometry. Part 3. Levelling--Simple and Compound Levelling--The Level Book--Parliamentary Plan and Section--Levelling with a Theodolite--Gradients--Wooden Curves--To Lay out a Railway Curve--Setting out Widths. Part 4. Calculating Quantities generally for Estimates--Cuttings and Embankments--Tunnels--Brickwork--Ironwork--Timber Measuring. Part 5. Description and Use of Instruments in Surveying and Plotting--The Improved Dumpy Level--Troughton’s Level--The Prismatic Compass--Proportional Compass--Box Sextant--Vernier--Pantagraph--Merrett’s Improved Quadrant--Improved Computation Scale--The Diagonal Scale--Straight Edge and Sector. Part 6. Logarithms of Numbers--Logarithmic Sines and Co-Sines, Tangents and Co-Tangents--Natural Sines and Co-Sines--Tables for Earthwork, for Setting out Curves, and for various Calculations, etc., etc., etc. _Saws: the History, Development, Action, Classification, and Comparison of Saws of all kinds._ By Robert Grimshaw. _With 220 illustrations_, 4to, cloth, 12_s._ 6_d._ _A Supplement to the above_; containing additional practical matter, more especially relating to the forms of Saw Teeth for special material and conditions, and to the behaviour of Saws under particular conditions. _With 120 illustrations_, cloth, 9_s._ _A Guide for the Electric Testing of Telegraph Cables._ By Capt. V. Hoskiœr, Royal Danish Engineers. _With illustrations_, second edition, crown 8vo, cloth, 4_s._ 6_d._ _Laying and Repairing Electric Telegraph Cables._ By Capt. V. Hoskiœr, Royal Danish Engineers. Crown 8vo, cloth, 3_s._ 6_d._ _A Pocket-Book of Practical Rules for the Proportions of Modern Engines and Boilers for Land and Marine purposes._ By N. P. Burgh. Seventh edition, royal 32mo, roan, 4_s._ 6_d._ _Table of Logarithms of the Natural Numbers, from 1 to 108,000._ By Charles Babbage, Esq., M.A. Stereotyped edition, royal 8vo, cloth, 7_s._ 6_d._