4» OHARLBS QRIFFIN * OO.'B PUBLIC ATIOKB. 



GRIFFIN'S NAUTICAL SEBIES. 



Skoond Edition, Revised. With Numerous Illustrations. 38. 6d. 



Practical Mechanics: 



Applied to the Requirements of the Sailor. 

 By THOS. MACKENZIE, 



Master Mariner, F.R.A.3. 

 General Contents. — Resolution and Composition of Forces — Work don* 

 by Machines and Living Agents — The Mechanical Powers: The Lever j 

 Derricks as Bent Levers — The Wheel and Axle : Windlass ; Ship's Capstan ; 

 Crab Winch— Tackles : the "Old Man"— The Inclined Plane; the Screw— 

 The Centre of Gravity of a Ship and Cargo — Relative iStrength of Rope : 

 Steel Wire, Manilla, Hemt), Coir — Derricks and Shears — Calciuation of the 

 Cross-breaking Strain of I?ir Spar — Centre of Effort of Sails — Hydrostat.ioi : 

 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 exoeedinglt helpful." — 

 Shipping World. 



' No Ships' Officbbs' bookcase will henceforth be complete without 

 Captain Mackenzie's ' Practical Mechanics.' Notwithstanding ray many 

 rears' experience at sea, it has told me how much more there it to acquire," — 

 (Letter to the Publishers from a Master Mariner). 



" I must express my thanks to you for the labour and care you hare tak«tt 

 in 'Practical Mechanics.' . . . It is a life's experience. . . . 

 What an amount we frequently see wasted by rigging purchases without reosoB 

 and accidents to spars, &c., &c. ! 'Practical Mechanics' would save au, 

 THifl." — (Letter to the Author from another Master Mariner). 



WORKS BY RICHARD C. BUCK, 



of the Thames Nautical Training <Ji liege, H.M.S. ' Worcester.' 



A Manual of Trigonometry: 



With Diagrams, Examples, and Exercises. Post-free 3s. 6d. 



Second Edition, Revised and Corrected. 



*,* Mr. Buck's Text-Book has been specially prepared with a new 

 to the New Examinations of the Board of Trade, in which Trigonometrj 

 is an obligatory subject. 



"This KMWKNTLT PKACTICAL and KBLIABLB VOLUMB." — SchOOlmatttr. 



A Manual of Algebra. 



Daaigned to meet the Requirements of Sailors and others. Price 88 .6d. 



•,• These elementary works on algebra and trioonomhtrt are written Bpeoi^ily foe 

 (hose who will have little opportunity of consulting a Teacher. They are books for "nv.t9- 

 KKir." All but the simplest explanations have, thereiore, been avoideii, and ambwks* M 

 th« Exercises are given. Any person may readily, by careful study, become master of tUalr 

 eontetita, and thus lay the foundation for a further mathematical course, if desireo It ia 

 hoped that to the younger Officers of our Mercantile Marine they will be found decidedly 

 ■erriceable. The Examples and Exercises are taken (roui the Examination Paper -«t for 

 the Ondets of the " Worcester." 



" Clearly arranged, and well got up. . . .A flrst-rate Elementary Algehra. • 

 Nautical Magazine. 



•,*For complete List of GRirrm's Nauticai, Sbribs, see p. 89. 



MWIDOJH; CHARLES GRIFFIN & CO., LI M JED, EXETER STREET, STRANG 



