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August, 1918 compressor jackets, inter-coolers and after-coolers, is supplied by a system of water pipes which later discharge the water into the Delaware river, along which the yard is located. Indicating and recording thermometers and pressure gages are installed in the pipes. An air-flow meter is also to be installed in the 12-inch discharge line leading from each compressor plant, be- tween the receiver and the 10-inch air main. Great Number. of Tools Used The two plants which feed into the 6-inch main at the head of the wet basins are similar to the others except: they contain only two of the smaller compressors, making the total capacity of each plant 4550 cubic feet of free air per minute. pressor. capacity of the yard 73,675 cubic feet per minute. Maintenance of the compressors is facilitated by a 10-ton, hand-operated traveling crane. For storage and operating maintenance of the air tools used on the ways, an uir- tool house has been built at the head of each group of five building slips. These buildings are equipped with grind- ing and lubricating machinery and stor- age racks. An idea of the volume of compressed air required in building the ships may be obtained from the following list of pneumatic tools in use: 1675 riveters of one size and 100 of another; 1325 holders-on; 200 jam riyeters of one size and 480 of another; 450 nonrevers- ing pneumatic drills; 200 corner drills; 150 breast drills; 100 chipping and caulking hammers of one size and 1250 and 500 of other sizes respectively; and 50 grinders. Eight hundred rivet heating ' forges are to operate from compressed air lines. Equipment necessary to! the operation of the pneumatic tools in- cludes about 300,000 feet of rubber hose, 6500 sets of pneumatic hose couplings, 150 bottom riveter frames, 12,000 chisel blanks and 15,000 rivet sets. June Ore Shipments Ore shipments for June establish a new record to supersede those of 1916 and 1917. The total shipments from upper lake ports for June, 1918, aggregate 9,921,860 tons. This ex- ceeds the June, 1917 shipments by 281,869 tons. The 1917 shipments in turn were greater than those of 1916, which totaled 9,607,576 tons, the 1917 figure being 9,639,991 tons. Although the June, 1918, shipments are in excess of the 1916 record, the total ship- ments to July 1, 1918, are less than they were for the same period in 1916. The shipments to July 1, 1916, were 19,615,567 tons; to July 1, 1917, were 16,135,135 tons; and for. the "same Period in 1918 are 18,949,730 tons. This This makes the entire com- . THE MARINE REVIEW year's shipments, therefore, have bet- tered the 1917 shipments, but still lag behind 1916. The following table shows the June and season's shipments by ports: June, To July 1 Port 1918 1918 | Eistanabay evince 1,077,871 1,733,366 Marquette: 0.55 7 en - 947,927 1,053,678 Ashland)? 34.7 ees 1,137,921 2,036,068 DUDENIOR a hei cs 2,510,974 4,698,565 Dit hith «srs si her gamete 3,164,296 6,276,139 Pwor Harbors vscs sa: 1,482,871 3,151,914 Potal S50 Bee. 9,921,860 18,949,730 LOTS <ancreasee tae, 2,814,595 281,869 Lake Erie Receipts Lake Erie ports received 7,816,993 tons out of the total of 9,921,860 tons which. were shipped from upper lake ports in June, as shown by figures compiled by THe Marine Review. The balance on dock Jufy 1 was 6,262,997 tons as against 4,823,523 tons on July 1, 1917. The detailed figures are: Port Gross tons BU ALG: cae os ec viens eres Heeler 1,414,311 Biles ie Oe aera te es 265,622 ZCONNCATIU mak sce once mete 1,068,118 Ashtabulan tee <8 ees os 1,756,023 Baitport: 0. AG See hs ass 330,360 @levelandee ss eee 1,604,742 Or ain yr es sr cte vote saeco is 614,094 EUUIPON: ase oe ees eas ce 242,726 Moledo. 2) acne eae 434,117 WM etrOlt: 20. on ee ee oe 86,880 Totals eect oars ee ols 7,816,993: ° Will Construct Concrete Boats Negotiations have been in progress for some time between the Aberthaw Con- ' struction Co., Boston, and the City of ' Providence, R. I., for the lease of land at Fields point for use as a shipyard. These are now completed and work will start immediately on laying out the yard and constructing ways for the building of concrete boats. The shipyard will be about 600 feet wide with a 300-foot depth. . Options have been taken for enlarging this if necessary. The Aberthaw company will build two ways immediately. These two ways will be used for the construction of two concrete lighters to. be built from the company's own design. The com- pany also plans to build concrete canal boats and watertank boats for the gov- ernment. The company built the Victory plant at Squantum, Mass., and for 25 years has specialized in concrete construction. The Emergency Fleet corporation has awarded a contract to build a third Ferris-type wooden steamer to the Benecia Shipbuilding Co. near San Fran- cisco. One boat of this type that the company built was launched in July and another will be put overboard in August. Three vessels, aggregating 9600 dead- weight tons, have been chartered by the Robert Dollar Steamship Co. and are to 333 be placed in the Asiatic service, loading at either Vancouver or Puget sound ports. The vessels, all owned by French interests, are the motor ship ALABAMA, the auxiliary powered schooner Bow es and the steamer OAxkwoop. Book Review Laying Off, or the Geometry of Ship- building, by Edward L. Attwood and Le Gs G. Cooper; cloth; 120 pages, 5 x 8 inches; published by Longmans, Green & Co. and furnislted by THe Ma- -RINE Review for $2. The book is by two English authors and it is written from an up-to-date point of view. The latest practices are explained at length. The work is adapted as a textbook for the use of students. The introductory | chapter treats of descriptive geometry in order to lay a satisfactory foundation of knowledge for the subsequent work. The book is well written. The subject is handled exhaustively, covering de- scriptive geometry; the mold loft floor and appliances for laying off; work on the -moid.. loft), floor; models; mold work on the flgor, and mis- cellaneous problems. An appendix has. also been added which contains a sylla- bus of board of education examination, questions set at examinations and other problems. The book contains 121 illus- - trations which have been carefully exe- cuted in order to make them seli- explanatory as far as possible. Despite the representation of the San Francisco Shipowners' association that the charter rate of $6.25 per month per deadweight ton is not sufficient, accord- ing to their books, to enable owners to run their vessels without a small loss in most instances, the United States ship- ping board has definitely refused to raise the commandeer charter rate for wooden steam schooners. -The Bethlehem Shipbuilding Corp. 1s to build ten 25,000-ton displacement troop ships for the war department at the new Alameda, Cal., unit. The con- struction of each of these vessels will require 8000 tons of steel shapes and plates. The Pacific Steamship Co. is to have a fourth vessel, the 7500-ton steel cargo carrier Pucer Sounp, assigned to her for operation in August when she will be completed by the Todd shipyards, Tacoma, Wash. With a capacity of 5000 tons, the second largest marine railway on the Pacific coast and among the largest in the United States, has been placed in operation at the new Barnes-Tibbitts shipbuilding yard at Alameda, Cal.