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60 ings of parts of marine engines and auxiliary machinery, which have been set at various times as tests at the British Board of Trade examinations for engineers' certificates of compe- tency, In addition to having been compiled for engineers desirous of taking the examinations, and studying for same while in service, the scope of the book has been extended so that it may form a text book of mechan- ical drawings for apprentices attend- _ing marine engineering classes. The drawings, 35 in number, have been specially prepared for this work and range from the most simple to the most intricate parts of a vessel's ma- chinery. The book-also contains some practical information on mechanical drawing. - Machine Details for Engineering Students, By Alexander Norwell, B. ee ( HK Puges 52; size, 7% Dy' 10 in. John Mitchell Pollock, Greenock. Price 1s 6d net. . The explanatory text in this work may seem somewhat elementary to the machinist or engineer schooled in machine drawing and construction, but to the student or engineer who has had limited opportunities for technical education it will be found invaluable. mae. rst hali- of. the book ...is meveted, to. the . text,. and, in addition to containing much useful information on machine_ design describes in detail the drawings in the second half. These latter in- clude complete working drawings for a set of launch engines and should be of considerable assistance to those desirous of taking up the 'study of mechanical drawings, Machine Drawing and Design for Beginners. By Henry J, Spooner, London and New York. Longmans, Green & Co.; 914 x 7; 266 pages. Sup- plied by Marine Review for $1.25, The author, who is director of me- chanical and civil engineering in the Polytechnic School of Engineering, London, has produced a work which is almost a complete course of instruc- tion in mechanical drawing, though in many details differing from the ordin- ary practice in this country, and is written in an easy, conversational style which. points clearly the reason for the various rules and suggestions... The student is apparently presupposed, how- ever, to have a much fuller knowledge of mathematics than is usually the case, in this country at least, where ele- mentary mechanical drawing, such as covered by the first six chapters, is usually taken up in advance of the students involved in the calculations employed in design and set forth in the . naby; TAe MaRINE EME succeeding chapters. This is, however, merely a difference in educational sys- tems. The work contains little or nothing which is not to the point, and the application of and the reason for the various formulae employed in the design of the parts used as examples is set forth in a clear and interesting man- ner. The work is profusely illustrated with examples of almost every imagin- able class of work and the method of construction and reason therefor made very plain. Ordinary commercial prac- tice in drawing office work does not permit of many of the instructions given being carried out, but these modifications will readily suggest themselves in prac- tice. Marine Propellers. By S. W. Bar- fifth edition; New York. Spon & Chamberlain; 51%4 x 8%; 182 pages. Supplied by the Marine Review for $4.50. Mr. Barnaby's work has been so long a standard that little needs to be said April, 1909 of this latest edition. A note giving the latest values obtained by Froude for maximum pitch-ratio efficiency jg inserted and also the latest informa- tion as to designing propellers for tyr- bine. ships. A new chapter on the in- fluence of depth of water on resistance is also added. As well known, Barnaby is neither a faddist nor a theorist, His work is chiefly: based on extensive ex- perience and careful experiment and will doubtless continue to be accepted as authority. Steam Boilers. By C. H. Peabody and E. F. Miller; second edition; 6 x 9; 419 pages; New York. John Wiley & Sons. Supplied by the Marine Rpg- view for $4. With the exception of a very brief chapter on superheaters and some new tables giving dimensions of and floor space occupied by different types of boilers, the subject matter is substan- tially the same as in the preceding edition of 1897. es se Pino the Patent Office NEW DESIGN OF CARGO VESSEL. An invention relating to cargo vessels of the kind having topside water ballast tanks, and particularly to that type of ship wherein the sides of the tanks are set back from alignment with the sides of the vessel, and having for its ob- ject the improvement of construction or arrangement of such vessels, has re- John R. F. Dettner, of Sunderland, England, Hitherto in cargo vessels hav- ing topside water ballast tanks, whether continuous or otherwise, a number of disadvantages have been experienced by reason of the construction adopted having proven more or less faulty in that the tanks were from various catses frequently apt to leak at the joints of the tanks and sides of the vessel, par- cently been patented in this country by ticularly when subject to shocks in- Pia ez ot. x is F; _ ee ) ; ) | h a h ky. FIG. 2 { come leds. || YOTLLILLEX FTC. 2: a f, é a )