51. NAVAL ARCHITECTURE, the Rudiments of; or an Exposi-tion of the Elementary Principles of the Science, and their Practical Application to Naval Construction. Compiled for the Use of Beginners. By James Peake, School of Naval Architecture, H.M. Dockyard, Portsmouth. Fourth Edition, corrected, with Plates and Diagrams. 3s. 6d # 53*. SHIPS FOR OCEAN AND RIVER SERVICE, Elementary and Practical Principles of the Construction of. By Hakon A. Sommer-feldt, Surveyor of the Royal Norwegian Navy. With an Appendix, Is. 6d. 53**. AN ATLAS OF ENGRAVINGS to Illustrate the above. Twelve large folding plates. Royal 4to, cloth. 7s. 6d.

54. MASTING, MAST-MAKING, AND RIGGING OF SHIPS,

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99. NAVIGATION AND NAUTICAL ASTRONOMY, in Theory and Practice. With Attempts to facilitate the Finding of the Time and the Longitude at Sea. By J. R. Young, formerly Professor of Mathematics in Belfast College. Illustrated. 2s. 6d. 100*. TABLES intended to facilitate the Operations of Navigation and Nautical Astronomy, as an Accompaniment to the above Book. By J. R. Young, is. 6d.

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155. THE ENGINEER'S GUIDE TO THE ROYAL AND

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55 PRACTICAL NAVIGATION. Consisting of The Sailor's

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. the requisite Mathematical and Nautical Tables for the Working of the

204. Problems. By Henry Law, C.E., and J. R. Young, formerly Professor of Mathematics in Belfast College. Illustrated with numerous Wood Engravings and Coloured Plates. 7s. Strongly half-bound in leather.

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