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Modern Cycles. A Practical Handbook on their Construction and Repair. Crown 8vo, 356 pages, with 304 Illustrations Cloth, price ros. 6d. post free.

"A most comprehensive and up-to-date treatise."-The Cycle.

"A very useful book, quite entitled to rank as a standard work for students of cycle construction."-Wheeling.

Refrigerating and Ice-Making Machinery.

Crown 8vo

300 pages, 87 Illustrations. Cloth, bevelled edges, price 7s. 6d. post free.

"One of the best compilations on the subject. The description of the different refrigerating machines, and the principles on which they act, are described with an intelligent appreciation of the means and the end. His book may be recommended as a useful description of the machinery, the processes, and of the facts, figures, and tabulated physics of its subject."The Engineer.

Sanitary Arrangement of Dwelling Houses. Crown 8vo, 206 pages, 123 Illustrations. Cloth, price 2s 6d. post free. "This book will no doubt be largely read, and will, we venture to think, be of considerable service to the public."-The Lancet.

7 Stationers' Hall Court, E.C.

Printed at THe Darien Press, Edinburgh.

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Assoc. MEMB. INST. C.E.



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'HE extraordinary restrictions against travelling


by mechanical means over the roads of this country, which have existed for so long a time, have now been partly removed by the passing of the Locomotives on Highways Act of 1896. Those restrictions have doubtless been the means of inflicting very great injury upon the trade of the country. This, indeed, must be only too evident, when it is considered that not merely have large and struggling classes of the community been debarred for years from the advantages they would have derived from this method of transport, but English engineers, unable to carry out even the needful experiments, have been forced to stand idly by, instead of occupying themselves in developing and perfecting the power-propelled road carriage, and so establishing a great industry.

At the present moment, it seems to the author that a satisfactory power-propelled carriage for common roads has yet to be designed. All that past experi

ments in this country, and the more recent experiments abroad, have succeeded in producing are vehicles which serve to show the practicability of devising carriages which may be driven by mechanical power, even with great facility, upon common roads.

Although, however, the motor carriage of the future is not with us yet, the present would seem to be an opportune time to place before the public a concise account of the various systems of propulsion which have been adopted for the vehicles now commonly designated motor cars or horseless carriages, and of the principal types of such vehicles which have been constructed to the present date. In the execution of this task the author has sedulously avoided entering discursively upon the theories of the various motors, subjects with which engineers should be already fully conversant, and with which other persons are not greatly concerned, and which, moreover, are already amply dealt with in many able treatises.

The author begs to acknowledge his indebtedness to the columns of The Engineer and of Engineering for much of the information which appears in a condensed form in the following pages, as also for some of the illustrations by which the text is elucidated. The full descriptions that have been given in these journals, especially during the past year, of motor cars possessing features worthy of consideration, must have rendered their perusal a task of pleasure and

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