GRINDING AND TAPPING TOOLS, PROCESSES, AND FIXTURES. By Joseph V. Wood- worth. New York: Hill Publishing Company. 8vo.; cloth; 162 pages illustrated. Price, $2. In machine shops the development of uses for emery wheels has been remarkable, and there Is to-day an immense amount of work done with the emery wheel that a few years ago it was not considered possible to handle in this way. “Lapping and Grinding” Is the very latest work on the subject, and is written in a clear, practical manner by a practical man. It .should he in the hands of every .mechanical engineer and up-to-date mechanic. The following list of contents is its best recommendation : Grinding; Conditions, Rules, Methods, Processes, Machines and A ttachments for Accurate Grinding; Use and Preparation of Abrasives; Laps and Lapping; Construction and Use of Tools and Processes for Finishing Gages, Tools, Dies, and Machine Parts to Accurate Dimensions, Construction, Use and Operation of Grinding Fixtures and Jigs for Finishing Repetition Parts and Articles of Metal, Small Hardened and Tempered Steel Parts and Special Work; The Hardening and Tempering of Interchangeable Tool Steel Parts of Delicate Structure which Require to be Ground and Lapped Afterward ; Percentage of Carbon Crucible Steel Ground Parts and Tools Should Contain. AGGLUTINANTS OF ALL KINDS FOR ALL PURPOSES. By H. C. Standage. New York: D. Van Nostrand Company, 1907. Cloth; 5112 x 8lh inches; 247 pages; 508 recipes and numerous notes. Price, $3.50. It is seldom that one finds such an excellent collection of recipes for glues and similar compounds so conveniently arranged as they are in this work. They are arranged under the headings of the trades to which they are of greatest use, and are also referred to in a complete index. Every recipe has been tested and found to do what is claimed of it. THE CONSTRUCTION OF DYNAMOS. (Alternating and Direct-Current.) A Text Book for Students. Engineer-Constructors, and Electricians in Charge. By Tyson Sewell. With nearly 550 illustrations and diagrams specially drawn and engraved for this work. London: Crosby, Lockwood&Son. New York: D. Van Nostrand Company. 8vo.; cloth; 316 pages. Price, $3. This work deals in a single volume of handy size with the theory, design, and construction of dynamos, both alternating and direct-current. The treatment is sufficiently detailed to make it useful as a textbook for students and apprentices as well as helpful as a reference book to engineers. The early chapters deal with fundamental principles; polyphase currents, however, being treated later on as an introduction to polyphase alternators. The examples of design introduced in the work are for illustration only, since the work of designing falls to the lot of comparatively few men ; most manufacturers having standardized particular lines, which can be made to fill the majority of requirements, with slight modification. SHAFT SINKING UNDER DIFFICULT CONDITIONS. By J. Riemer. Translated from the German by C. R. Corning and Robert Peele. New York: John Wiley&Sons. 8vo.; cloth; 19 plates, 176 pages. Price, $3. Little need has arisen in America to exploit mineral beds that are very difficult to work. Where the difficulties have seemed too great, such bodies have been allowed to remain undeveloped, and deposits of easier access have been successfully sought. In Germany the conditions are different. Mining operations are carried on there under conditions that we would consider too unfavorable to be profitable. It is with some special cases of such a nature that this work deals ; cases in which the soil was so permeated with , water that the difficult freezing mthod, as well as others, had to be resorted to before the operations could be completed with success, or indeed could be completed at all. STANDARD POLYPHASE APPA R A T U S AND SYSTEMS. By Maurice A. Oudin. New York: D. Van Nostrand Company. London: Sampson Low&Co. 8vo.; cloth; 369 pages, 207 illustrations and diagrams. Price, $3 net. This book, first issued in 1899, has reached its fifth edition and has been enlarged and brought up to date. Full of practical information and containing a. number of useful tables, it forms a valuable reference book for men who operat.. or are interested in alternate current machinery. THE MANUAL OF STATISTICS. New York: The Manual of Statistics Company, 1907. 8vo.; pp. 1064. Price, $5. The Manual of Statistics for 1907, being the twenty-ninth annual issue of that standard reference publication, h-as just made its appearance. As usual, it contains in concise and complete form the information regaroing railroad and industrial corporations of the United States and Canada, government securities, mining stocks, and the grain and cotton stocks which are required by investors, speculators, REVISED EDITION 15,000 Receipts 734 Pages Price $5.00 MAILED TO ANY PART OF THE WORLD THE SCIENTIFIC AME RICA N CYCLOPEDIA OF RECEIPTS, NOTES AND QUERIES has had an unprecedented sale. It has- been used by chemists, technologists, and those unfamiliar with the arts, with equal success, and has demonstrated that it is a book which is useful in the laboratory, factory or home. It consists of a careful compilation of the most useful receipts, and information which have appeared in the SCIENTIFIC AMERICAN for more than half a century. Over 15,000 selected formulre are here collected, nearly every branch of the useful arts being represented. Many of the principal substances and raw materials used in the arts are described, and almost every inquiry relating to formulre will be found answered. It is more than a receipt book, as in most cases it gives all the standard and special formulre, thus enabling the reader to find a receipt which fits his peculiar need. An alphabetical arrangement with abundant cross references makes it an easy work to consult. Those who are engaged in any branch of industry will find this book of the greatest practical value, and we especially commend it to those who are in search of an independent business, as they will find many formulre for the manufacture of salable articles which will be worth many times the cost of the book. The Appendix contains the very latest formulre as well as 41 tables of weights and measures, and a Dictionary of Chemical Synonyms. RECEIPTS, Send for Full Table of Contents M a i led F r e e on Re que s t MUNN&COMPANY, Publishers 363 BROADWAY, NEW YORK and stock market intere»ts. In fact, the 1,064 pages of the compact and handsome volume present a greater fund of data and statistics of a practical character than any other work on such subjects; its utility being enhanced by an arrangement rendering reference to the contents of any section easy and satisfactory. The present edition also devotes much attention to the newer mining companies whose stocks have become such a feature in the stock markets of the United States, a class of organizations and securities on which full and accurate information is often difficult to obtain. It gives throughout evidence of accuracy and careful compilation and is brought down to date in its descriptive and statistical details, malting the volume one which investors and all who are interested in the financial and other markets of the country cannot afford to be without. DICTIONARY OF ENGINEERING TERMS IN ENGLISH AND SPANIS H. With Indexes in Both Languages. By Andres J. R. V. Garcia. New York: Spon&Chamberlain, 1906. 4% x 5lh inches; cloth; 150 pages. Price, $1. A handy technical dictionary in Spanish and English is a necessity for those who are engaged in the constantly expanding relations with the Latin-American countries. Mr. Gar- da's work is furnished with an index in the two languages, lessening greatly the work of translating from Spanish into English. LLOYD'S REGISTER OF AMERICAN YACHTS. New York: Lloyd's Register of Shipping, 15 Whitehall Street. 8vo. large; pp. 410. Price, $7.50. The growing of yachting in America shows itself in the steadily-increasing size of Lloyd's Register of American Yachts. The volume before us for 1907 contains over 400 pages and records the full particulars of nearly .3,500 yachts owned in the United States and Canada, the name and address of the owner of each yacht being also given. The information regarding the yachts includes the material of construction, type. rig. sail area, official number, signal letter, tonnage, length over all and on the waterline, extreme breadth and draft, name of the designer and builder, place and date of launch, and particulars of the machinery. Very handsome are the pages of the book which are devoted to the colored illustrations of private signals, of which there are 1,872, and of club burgees, 300 in number. The officers of nearly 350 clubs and yachting associations are also given. THE ROMANCE OF STEEL. The Story of a Thousand Millionaires. By Herbert N. Casson. New York: A. S Barnes&Co., 1907. Cloth; 376 pages, 63 portraits. Price, $2.50. As its title suggests, this is a popular book, dealing briefly with the rise of the iron industry in the United States, and at length with the careers and personalities of the men who have- directed the wonderful expansion which followed, at first slowly, the discov ' «s of Kelly. and Bessemer. The book contains few statistics, and those in popular : form; the author is more interested in giving glimpses of the real men behind the steel. We see the men rather than the millionaires, and understand the capacities in each which fitted them to act as cogs in the great machine of the greatest American industry. ANNUAL REPORT OF THE BOARD OF SCIENTIFIC ADVICE FOR INDIA FOR THE YEAR 1905-06. Calcutta: India Government Central Press. 8vo.; paper. A resume of the official scientific inquiry carried on in India. DIE TECHNOLOGIE DER APPRETUR. EIN LEHRBUCH ZUM UNTERRICHT A N TECH- NISCHEN FACHSULEN WIE ZUM SELBST- UNTERRICHT. Von Dr. A. GarswiIidt. Wien und Leipzig: A. Hartleben's Verlag. With 155 illustrations. 8vo.; paper bound ; 317 pages. FIRST-CLASS BATTLESHIP “CONNECTICUT" (Continued from page 4O!J.) 16,500 horse-power. The “Connecticut” is particularly interesting, at the present time, as having been selected as the flagship of the Pacific fleet, special accommodations for this purpose having been provided when the ship was under construction. It is also to be remembered that the “Connecticut” was built entirely at a government navy yard, contemporaneously with the construction of the “Louisiana” at a private yard. The high character of the work on the “Connecticut,” and the fact that she was built in the same time as the “Louisiana,” and that her extra cost, in view of the higher pay and shorter hours of government employees, was less than was expected, has established, conclusively, the ability of the government to do the very highest character of work at a reasonable cost in its own yards. The other four. ships of this class differ slightly from the “Connecticut” in the arrangement of the protective deck and in the thickness of the belt, which has been reduced amidships from 11 to 9 inches.