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380 from payment of charter hire on ship- ping board vessels used during the war with Germany. Section 16--Terminates the authoriza- tion given the board during the war for building, etc., houses or buildings. Section 17--Shipping board to take over on Jan. 1, 1921, all terminal prop- erties acquired by the war department during the late war. Section 18--Prevents the American vessels to foreigners out the consent of the board. Section 19--Authorizes the board to issue "orders in council' to protect American ships against unreasonable foreign competition, giving such "ord- ers in council" the effect of law. Section 20--Denies entry to American ports of any vessel which grants "de- ferred rebates," or to a line which sale of with- uses "fighting. ships," or a line that. retaliates against any shipper. Section 21--Extends coastwise laws to insular possessions and territories of the United States on and after Feb. t 1927; Section 22--Closes coastwise trade to foreign ships. Section 23--Exempts American. steam- ship companies from the excess profits tax when such funds are invested in new shipbuilding. - Section 24--The mails shall be carried | only on American vessels, if practicable, and the postmaster general is author- ized to make contracts to that end. ~ Section 25--The American Bureau of Shipping is made the official classifica- tion agency for American vessels. Section 26--American freight vessels peimitted to carry not in excess of 16 passengers. Section 27--Merchandise shipped be- tween points in the United States. must be transported only on American ves- sels, within certain limitations. Section 28--Permits discriminatory in- iand rail rates on goods imported or exported in American ships. Section 29--Provides law for the creation and encouragement of Amer- ican marine insurance companies. Section 30--Siandardizes and _ pro- tects the equity involved in ship mort- gages. Section 31--American seamen may demand and receive one-half the wages due 'them at any port an American ship stops; foreign seamen on foreign ves- sels are granted the same privilege in the ports of the United States. Section 32--No seaman may receive a wage in advance of the time the same has been actually earned. Section 33--Permits the recovery of damages by seamen for personal in- jury. Section 34--Authorizes the repeal of treaties preventing the imposition of THE MARINE REVIEW discriminating duties on goods imported in American bottoms. Section. 35--Powers delegated the board may be exercised through the Emergency Fleet corporation. Section 36--If any portion of the law is declared unconstitutional, it is not to abrogate the remainder or any part of the remainder of the act. Section 37--Defines the meaning of certain terms used in the phrasing of the law. - Section 38--American corporations operating in the overseas trade must kave a majority stock issue in the pos- session of American citizens. Coast- wise corporations must be 75 per cent owned by Americans, Section 39--Stipulates that this law is to be known as the "Merchant Ma- moe Act, 1920 Book Reviews Latitude and Longitude, Millar; cloth; 54 pages, 434 x 7% inches, published by Charles Griffin & Co,, Ltd., and furnished by THE MARINE Review for $1.00. This book is now in its third edi- tion and a few additions have been included. Also some minor _ correc- tions have been made. The object of the book is to present to the reader in a concise manner, many of the problems that pertain to the find- ing of a vessel's position at sea through the medium of altitudes of the sum or. stars. It is. pointed . out by the author that no attempt has been made to go beyond this point as the student of navigation must re- fer to more complete treatises to master the whole science of naviga- tion completely. The author presents the subject, in an exceptionally clear manner and explains each point step by step, which should eliminate confusion on the part of the student. The first part of the book is devoted to an explanation of mathematical expres- sions, angles, trigonometrical ratios and logarithms. The last named sub- ject is often a stumbling block to many students, especially those of comparatively limited education who have worked their way aft from the forecastle but in the present case the author explains this complicated sub- ject in a simple and thorough man- ner that should enable. anyone who can read and write to master the subject. How to find latitude and longitude is next taken up. The subject matter is Clearly written in nontechnical lan- guage and illustrated by numerous line drawings. Many practical ex- amples are included to enable the student to become proficient through by W.F- July, 1920 actual practice of working out prob. lems. Sumner's. method for finding longi- tude is fully explained. Ordinarily, this is a difficult problem to attempt to teach by text alone. The explana- tions are concise and easily under- stood. Several line drawings. and practical examples are included in this section. A thorough knowledge of this subject is imperative for those who wish to become proficient navigators. the subject of finding a. ship's longitude by sunset observation is thoroughly explained by means of practical examples. The book will prove of value both to students of navigation and as a hand book for navigators who often feel the need of authoritative data in checking up methods used in their everyday routine. Naval Architect's, Shipbuilder's and Marine Engineer's Pocket-Book, by Clement Mackrow and Lloyd Wool- lard; leather, 760 pages, 4 x 6% inches; published by the Norman W. Henley Publishing Co. and furnished by Tue MarinE Review for $6.00. This. book is now in its twelfth edition and has been revised and brought thoroughly up to date. It contains all the ordinary formulas, rules and tables required to work out neces- sary calculations, put in convenient form for ready reference. The work is condensed and practical in order that the naval architect may have at hand reliable data which other- wise often entails a long search through many 'volumes. It is pointed out that several ele- mentary subjects are treated more fully than may seem consistent with the character of the book. This was done for the benefit of those who have received a practical rather than a theoretical training. The book would be of little value to such men were they not enabled by means of elementary principles to learn, and understand the use of formulas. The book contains a section devoted to aeronautics. In the present edition the pub- lishers took the opportunity to cor- rect a few errors that had arisen in previous editions and to add a valu- able appendix. This section contains some supplementary notes referring to various sections of the book and a comprehensive article on estimating the cost of a merchant vessel. This feature is especially valuable to comparatively small and new _ ship- yards where a definite system is not always in operation. The ap- pendix was written by Colin Bart lett, Lloyd's surveyor.