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22 tributing system of the gas works, was, for test purposes, passed through a valve into a _ tank provided with steadying screens; and a weir 1 ft. wide; the height of the still water was recorded on a strip of paper on a drum rotated by clockwork, thus furnishing a timed rec- ord of the actual flow over the weir. During the test the air-compressor was run at 150 revolutions and at 160 revo- lutions per minute; the recorder showed an average flow of about 2 in. over the weir, or about 15 cubic feet per minute, and the efficiency of the compressor was then taken on the method usually adopt- ed, of counting the number of strokes required to fill a measured receiver from atmosphtric pressure to the working pressure, and correcting for differences of temperature, to ascertain the volume of free air actually compressed for this purpose. The measurement of the re- ceiver was 9.6 cu. ft., or, with the pipes and valve chambers, exactly 10 cu. ft.; which space was filled to 135 lbs., the working pressure, by 164 strokes (the average of three observations), which, with corrections for temperature, means a compression of 0.51 cu. ft. of free air per revolution of the engine. Thus, at 150 revolutions, and 0.51 cu. ft. per revo- lution, 76.5 cu. ft. of air were compressed to faise 13%4 cu. ft. of water, or a ratio of air to water of 5.8 to 1, and this while raising the water 256 ft. with an iminercion of 324 ft; or a tatio of 86 per cent of the total length of the rising main. Further particulars of the tests are given below: Revolutions of compressor per TMANMtO oe oe ee eed ws 150 160 Free air compressed, in cu. ft. 76.5 81.6 Heicht of flow over 12 in. weir 1% in. 2 in. full Equivalent delivery in cu. ft.. 1322 14.54 Volume of air per volume of WAKOD SS es hee ese wien baie 5.8 5.61 Horsepower equivalent of wa- CER TCU hs shi. egos he ec 6.4 7.04 Horsepower as per indicator diagrams from steam cyl- INGE eae oe ae a, Se 17.8 19.6 Eiierency.;of plant. /......... 30'D. C:-o0'D. Ce Ratio of immersion to height Of Tising main. es. os. css SO kG 0 As' the quantity of air required in- creases materially as the proportion of immersion to lift decreases, to enable comparisons to be made it is essential to reduce records to a common standard, preferably 60 per cent of immersion to 40 per cent of lift, which has been found to give the best results. The correction of the above figures to this standard gives the volumes of free air required per cubic foot of water raised as 5.05 and 4.87 cu. ft. respectively; and as un- der similar conditions the best records of other air-lift pumps indicate a prob- able requirement of about 8 cubic feet of free air to be compressed, the claim that the tapering tube-pump will raise half as much more water as can be done with parallel tubes, with the same power, seems to be supported; the exact ratio in this case is 160 to 100. TAeE Marine REVIEW Although the air-lift pump is not so ef- ficient as a first-rate barrel pump, it is obvious that it has advantages under cetr- tain conditions, one of the greatest of these being that the working parts and machinery may be at a great distance from the well. Another advantage is that it is quickly and easily installed. Now that the ef- ficiency of this system has, by the use of the tapered pipe, been so much increased, there does not seem any reason why the ait-lift pump should not be more used than it has hitherto been. TURBINE STEAMERS OF THE YEAR. The tonnage of the turbine steamers 'launched during 1906 was very high, owing to the floating of the Lusitania at Clydebank and the Mauretania at Wallsend; but the number of vessels was not so large as to be worthy of special note. The following is a list of the vessels as they appear in our returns, with the tonnage and builders Of each: ADRIATIC'S MAIDEN VOYAGE. It is announced that the White Star line's new palatial steamer, Adriatic, 25,- ooo tons, will make her maiden voyage to New York from Liverpool, and not from Southampton. As already stated, she will leave Belfast at the end of April, and proceed to Liverpool. After having been open for public inspection for some days, the Adriatic will sail di- rect from Liverpool to New York. For this voyage the bookings are proceeding with considerable rapidity. The Adria- tic will sail from New York on May 22 for Southampton, and she will inaugu- rate the new mid-weekly service from that port on Wednesday, June 5. The White Star line, in conjunction with the London and South Western Railway Co., have completed special ar- rangements for conveying passengers to and from Southampton. On the morning of each sailing day a special express train will leave Waterloo station, Lon- don, at 7:30 with second and third-class passengers, and another special boat train will leave Waterloo at 8:55 with first- Vessel. Lusitania Mauretania Dene my ey ee a ick, Heo, & Dreadnatcht. 70°, Rewa Creole Yale Governor Cobb St. George St. Patrick St. David Marylebone Viper Kingfisher Dueitece Of Mrovil (7... Atlanta ive te ye Sc eke oe Maree 2. Be Des. ogee s eee ee ee tw we ee eww ew eee oe ee eee wee ee wm ee woe ee ee eee em ee we ee ee we ee eee ee ee eee eee eee ewe te oe ew ee eee ee ee ee eee eee we we ew ee em oo 8 Ce ee ee eee eet eee oe ee me ee we eo ee ee ee meee eee oe Ce ec eee eee ee ee we owe eee oe ew Ce a ee ee eee eo eee ee oe ee we ee eee eee Tons. 33,000 John Brown & Co. 33,000 Swan, Hunter & Wigham Richardson. 2,009Swan, Hunter & Wigham Richardson. 17,900 Portsmouth Dockyard. 7,003 Wm. Denny & Brothers. 6,000 ore River Ship Building Co., Quincy, Builders. Mass. 4,500 Roach's Ship Yard, Chester, Pa. 2,525 Roach's Ship Yard, Chester, Pa. 2,456Cammell, Laird & Co. 2,387 John Brown & Co, 2,387 John Brown & Co. 1,972 Cammell, Laird & Co. 1,713 The Fairfield Co. 871 Wm. Denny & Brothers. 583 Wm. Denny & Brothers. 486 John Brown & Co. 1;500,)..S; White '&. Co. 681 J. I. Thornycroft & Co. 120,973 SUBMARINE RAISED. The raising of the ill-fated French sub- marine, Lutin, which sank in 150 ft. of water has been accomplished. This is a remarkable operation owing to the depth of water, but it was safely brought about by means of a floating dry dock which was lowered below the water line and the submarine attached by heavy chains. The dock was then raised by emptying her water tanks and the dock and sub- marine towed into port. An English invention recently put forth offers a detachable compartment, in which several persons might escape pro- vided the submarine strikes the bottom in a position - to allow of releasing the compartment. class passengers, and the steamer will sail at 11 a. m. In like manner special train services will. be run from Paris to Cherbourg. THey will leave the form- er city at 8:45 a. m., and will arrive at Cherbourg in time for the passengers to join the steamers leaving at 4:30 p. m., and which are to sail direct to Queens- town to embark the mails for America. The inward steamers will proceed di- rect to Plymouth to land mails; thence to Cherbourg, and from there to South- ampton. At Cherbourg the passengers will be disembarked and embarked by the Birkenhead ferry steamer' Birken- head, which has just been purchased, and which will be converted into a tender with a new name. Harland & Wolff are about to estab- lish a branch of :their engineering plant at Southampton.