The following text may have been generated by Optical Character Recognition, with varying degrees of accuracy. Reader beware!

May, 1913 A table showing properties of tubes and round bars is given with an ex- planatory article. This table gives various physical properties, including circumference, area, weight, surface in square feet, volume, moment of iner- tia, radius of gyration, etc., for tubes and round bars up to and including 36 in. This data is given in incre- ments of 0.01 in. up to 16 in, and increases from there by % in. incre- ments to 36 in. The metric system is included with conversion methods for most of the more commonly used measures, includ- ing temperatures. A glossary of terms used in the pipe and fittings trade will be found in the back of the book and in many instances the meanings of many of the more or less well-known words used in this trade are defined. Shipping World Year Book; pub- lished by the Shipping World, Effing- ham House, Arundel street, Strand, London. This is the twenty-seventh edition of a work that has become encyclo- pedic in character. Some of the new features include the tables of free- board revised to date by the board of trade, the present position of Euro- pean nations in respect to an inter- national load line and also of life- saving regulations; a digest of the merchant shipping acts from 1894 to 1913 with all orders in council and board of trade regulations pertaining thereto. The new map for 1913 shows in distinguishing colors the routes of steamers and railways throughout the world with the east-bound and west- bound lines across the Atlantic and the ports, coaling stations, coal fields of all countries. The directory of all the commercial ports of the world gives the particulars of the accommo- dation, charges, tides, trades, pilotage and towage and is revised to date. The tariffs of all nations haye de- manded minute care in revision during the past 12 months and many impor- tant changes will be found in them. New Log and Versine Altitude Ta- bles, by Lieut. Radler de Aquino; 122 pages, 6 by 9% in.; price 60 cents; J. D. Potter: 145 Minories, i. C., London, publisher. This book tabulates the elements of the astronomical triangle of posi-', tion, rendering its solutions by means of complicated formula and log eerie unnecessary. "Look out," cried the chauffeur as he ran over the Irishman. "Faith," Said Pat, sitting up, "are yez coming back." THE MARINE REVIEW Third Lock at the Sault Excellent progress is being made upon the' construction of the third lock at the Sault. The excavation of the lock pit was completed early in the year. The work is covered by separate con- Dredge & tracts, 4 [he Great Lakes MODEL UPPER. AND LOWER ENDS OF THIRD LOCK Dock Co., of Chicago, has the contract for the lock masonry and for the east canal: Mac Arthur: Bros, Co, of Chi- cago, have the contract. for the west canal. Other contracts are as follows: 181 holland Co. Pittsburgh; arc lighting system, Westinghouse Electric & Mfg. Co., East Pittsburgh, Pa.:: fir timber, . John Schroeder Lumber Co., Milwaukee, Wis., and McCormick Lumber Co., Mc- Cormick, Wash. Some work still re- mains to be contracted for, the most important of which is that of con- structing the new power house. The contracts for canal construction call for completion in May, 1914, and more than one-third of the -- work is now finished. The date fixed for the completion of the lock masonry is July, 30, 1913. Work is progressing satis- factorily on all contracts and it is be- lieved that the entire work will be fin- ished in 1914. The lock will be 1,350 ft. se 80. ft, wide and with the least depth of water over .the."miter: sill 24 ft, 5 in. Te: wall, therefore have an available draft of about 6 ft. more than the Poe lock. Its unusual length will permit 'the lock- ing through of two of the: largest: oves- sels in tandem style at one time.' ~ Six culverts «are provided | for: to. fill and empty the lock. The walls are built up from bed rock in sections,. alternate sections being constructed first and the intermediate 'séctions " later, "The walls are 50 ft. high and 26. BS, wide at the base. The 'Necessity of Boiler | Circulation - The Eckliff. boiler circulator, .man- ufactured by.. the Eckliff . Automatic Boiler. Circulator Co., Detroit, Mich., NEW. LOCK AND CANAL, GENERAL VIEW LOOKING WEST FROM MIXER PLANT : ke gates, Penn Bridge Co., Beaver Falls, Pa, pumping plant, Alberger Pump & Condenser -Co., New York; machinery and valves, J. & J. B. Mil- consists of a series of tubes bent to conform with the furnaces. These tubes are constructed to run _ verti- cally from the bottom of the boiler