A Treatise On The Principles And Practice Of Dock Engineering

♦ï WARLK3 GRIFFIN * 00.‘8 PUBLIOA TIONB. GRIFFIN’S NAUTICAL SERIES. Second Edition, Revised. With Numerous Illustrations. Price 3s. 6d. Practical Mechanics: Applied to the Requiremerits of the Sailor. By THOS. MACKENZIE, Master Mariner, F. R.A.S. General Contents. —Resolution and Composition of Forces—Work done by Machines and Living Agents—The Mechanical Powers: The Lever; Derricks as Bent Levers—The Wheel and Axle : Windlass ; Ship’s Capstan ; Crab Winch—Tackles : the “Old Man”—The Incliued Plane; the Screw— The Centre of Gravity of a Slup and Cargo — Relative Strength of Rope : Steel Wire, Manilla, Hemp, Coir—Derricks and Shears- Calculation of the Cross-breaking Strain of Kir Spar—Centre of Effort of Sails— Hydrostatics : the Diving-bell ; Stability of Floating Bodies ; the Ship’s Pump, &c. “ This excellent book . . . contains a large amount of information.” —Nature. “ Well worth the money . . . will be found exceedingly helpful.”— Shipping World. “ No Ships’ Officers’ bookcase will henceforth be complète without Captain Mackenzie’s ‘Practical Mechanics.’ Notwithstanding my many years’ experience at sea, it has told me how much more there is to acquire.”— (Letter to the Publishers from a Master Mariner). “ I must express my thanks to you for the labour and care you have taken in 'Practical Mechanics.’ . . . It is a life’s experience. . . . What an amount we frequently see wasted by rigging purchases without reason and accidents to spars, &c., &c.! ‘Practical Mechanics’ woüld save all this.”—(Letter to the Author from another Master Mariner). WORKS BY RICHARD C. BUCK, of the Thames Nautical Training Oollege, H.M.S. ‘ Worcester.’ A Manual of Trigonometry : With Diagrams, Exampies, and Exercises. Price 3s. 6d. Second Edition, Revised and Corrected. *,* Mr. Buck’s Text-Book has been sfecially pkwabed with a view to the New Examinations of the Board of Trade, in which Trigonometry is an obligatory subject. “This eminently practical and RELIABLE volume." —Schoolmaster. A Manual of Algebra. Designed to meet the Requirements of Sailors and others. Price 3s. 6d. %* These elementary works on algebra and trigonometry are written specially for those who will have little opportunity of consulting a Teacher. They are hooks for “selv- Help.” All but the simplest explanations have, therefore, been avoided, and answers to the Exercises are given. Any person may readily, by careful study, become master of their contents, and thus lay the foundation for a further mathematical course, if desired. It is hoped that to the younger Officers of our Mercantile Marine they will be found decidedly serviceable. The Examples and Exercises are taken from the Examination Papers set for the Oadets of the “Worcester." “Clearly arranged, and well got up. . . A tirst-rate Elementary Algebra. — Nautical Magazine. %♦ For complète List of Griefin’s Nautical Series, see p. 39. LONDON: CHARLES GRIFFIN & CO„ LIMITED, EXETER STREET, STRAND.