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16 MARINE REVIEW. inch reflector. These are controlled by hand. They were constructed at the Schenectady works of the company and in workmanship and efficien- cy are equal tothe best search lights of European manufacture. The signalling is also effected by electricity, the signalling apparatus con- sisting of four double lanterns each containing one red and one white incandescent lamp. The various combinations are made by throwing the current into the several lamps at will, by means ofacircular dial around which moves an arm pivoted at the dial center. The motor work is confined at present to the operation of the ventilators. Of these there are four sets. Two are stationary and are each driven by a two horse power motor, while the other two are portable and are operated by one- quarter-horse power motors. The motors being mounted directly on the axle of the blower the combination has that compactness which is so necessary in the restricted limits of a battle ship. CONTRACT TRIAL DATA. Draught of water, beginning of trial, forward, feet and inches, 22-1; aft, feet and inches, 23-4; end of trial, forward, feet and inches, 21-4, aft, feet and inches, 23-3; mean, forward feet and inches, 21-8% ; aft, feet and inches, 23-314; average on trial, feet and inches, 22-6; displacement mean tons, 7,387; area immersed midship section, 1,125; wetted surface, square feet, 27,660 ; mean speed, knots per hour, 23,073; I. H. P. main engines only 20,366.23 ; main engines, air and circulating pumps, 20,453.40; all machinery in use, 20,862.30. ' SYNOPSIS OF STEAM LOG. Center. Starboard. Fort. Slip of screws, per CeMt........ veers Ae 19.44 20.15 Revolutions main engines per minute....... 132.19 131.95 naan Revolutions main engines, mean.............. 132.4 Piston speed, feet per minute.................04 925.33 923.65 931.7 Steam pressure mean at engines........ ..... 148.1 T5007 149 Steam pressure first receiver, absolute...... 72.5 74.8 72.9 Steam pressure second receiver, absolute.. 24.6 26.3 27.4 Vacuum in condenser, inches..................- 25.31 25.11 24.76 Throttle valve Opening. ........ ssssesee-sesereee Wide. Steam cut-off in fraction of ce i oe o ee fg from beginning, Tp 70 70 (69 PAD Par Gy tle tan. assent escane tees mee 1,978.92 1,876.36 1,779.93 Ter Gy Mitten nen aceetesens (eh eceeen iene 2,370.87 2,239.48 2,181.18 ele yi Wide teens of eee neeeeee teen 2,869.03 2,470.88 2,599.58 Collective, each main engine...... 7,218.82 6,586.72 6,560.69 Collective, all three main engines 20,366.23 Miata atte PULP Sa.ccnstrer acess: snentaes 8.39 10.91 13.87 LELP. | vain circulating pumps............+ = 18rd 18. 17.56 Four main boiler feed pumps...... 90.96 Sixteen forced draft blowers...... 263.04 Otherauxiliaries. .......cc-.0s0.00c---02 54.90 Collective, main engines, air and Circulating pumMpsireces.-.carcvene 20,453.40 | Total all machinery in use.......... 20,862.30 IN {an SHOWING POSITION OF MINNEAPOLIS THREE SCREWS. Some Features of the Minneapolis. All the steam surfaces, pipes etc., of the cruiser Minneapolis are covered with magnesia. In fact this covering has been quite generally adopted in the navy as well as inthe merchant service. An idea of the amount of piping and steam furnaces in a war ship with three engines can be had from the fact that the Philadelphia agents of the Keasbey & Mattison Co. furnished 15,000 square feet magnesia blocks for the Minneapolis. On the lakes the Detroit Dry Dock Co., Chicago Ship Building Co. and F. W. Wheeler & Co., use magnesia very extensively and it has given entire satisfaction. The prominent lake agents are Frances Line, Cleveland, O.; S. P. Conklin, Detroit, Mich.; F. Sprinkman, Milwaukee, Wis.; Watch & Wyette, Chicago and R. A. Keasbey, Buffalo. It is interesting to note that in making her wonderful speed Poca- hontas coal was used in the boilers of the Minneapolis, and the heat pro- ducing qualities of this coal are such that it was not hand picked as is usually done for trial trips. The following concerns furnished auxiliary machinery for the Minne- apolis: Geo. F. Blake Mfg. Co. New York, N. Y., pumping machinery; General Electric Co. Schenectady, N. Y., electric installation; Wheeler Con- denser and Engineering Co. New York, N. Y., auxiliary condenser; Ameri- can Ship Windlass Co. Providence, R. I., windlasses; Williamson Bros, Philadelphia, Pa., steering engines; B. F. Sturtevant Co. Boston, Mass., blowing engines; H. B. Roelker, 41 Maiden lane, New York, dense air machine; C. H. Cory & Son, 278 Division street, New York, telegraphs. Trade Notes. The Berlin Iron Bridge Co. of East Berlin, Conn., has just completed for the H. W. Johns Mfg. Co., Brooklyn, N. Y., a new dryer house which is built entirely of steel. The Champion Rivet Co. of Cleveland is putting in, as an addition to its works, one of the largest rivet making machines manufactured. With this equipment the company will be able to furnish rivets up to 13 inches diameter. Particular attention is being given by this concern to steel rivets for marine boilers. The Columbia pad calendar for 1896 has made its appearance, repre- senting the eleventh annual issue, and handy and convenient as it has been heretofore, the new issue certainly surpasses any of its predeces- sors. The cycling fraternity, to say nothing of the general public, has acquired a decidedly friendly feeling for the Columbia calendar, and its annual advent is looked forward to with interest and pleasure. It can be obtained for five 2-cent stamps from the Pope Mfg. Co., Hartford, Conn. The advantages of the Morison suspension furnace for marine boilers were set forth in a neat book some time since and now a similar publica- tion gives drawings and illustrations of the furnace in stationary boilers, Several of the illustrations are half tone and the drawings will be valuable for reference in any engine or boiler building concern. The book may be obtained frem the Continental Iron Works, Brooklyn, N. Y. The General Electric Co. through J. W. Kellogg, Schenectady, N. Y. closed five large electric lighting contracts, Monday and Tuesday. One was for four steamers building at F. W. Wheeler & Co's. yards West Bay City, Mich , for Roby & Waldo, Eddy Bros, D. Whitney and Mitchell & Co., and the other was for the revenue cutter building by the Globe Iron Works Company, Cleveland. The three barges building at South Chicago will also have electric outfits from the same company. The Almy Water Tube Boiler Co., Providence, R.I., has contracted to build two boilers for J. C. Rhodes of New Bedford, for a new steam yacht, to furnish 500 horse power. They are building a stationary fifty ~ horse power boiler for W. D. Forbes & Co. of Hoboken, N. J.; also four boilers for the new ferry boat now building for the Pennsylvania Co., to run between Camden and Philadelphia; also, one boiler for the passenger steamer Sylvia, of Rockland, Me., and they have an order for a thirty horse power boiler for asteam launch, for Mr. E. D. Joyner of Schen- ectady, N. Y. Illustrated Patent Record. 551,843. Vessel. Herbert Wycherley, Parkville, and John W. Barlow, Brooklyn, N. Y. Filed June 14,1894. Renewed May 17, 1895. Serial No. 549,707. Claim. A vessel having channels in its surface forming downwardly inclined and curved lifters at each side of the bow only to act only on the water as it is parted by the bow to elevate the bow of the vessel by the movement through the water. 551,848. VESSEL. 551,962. DREDGING-MACHINE 551,962. Dredging Machine. John W. Henderson, Tunica, Miss. Filed July 15, 1893. Serial No. 480,677. Claim. In a device for dredging rivers, a rod or shaft having a chain or cable connected thereto, a revolving device situated around said rod or shaft, said revolving device constructed of sections bolted together and forming blades or cutters.