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TAE MarRINE REVIEW PLATE test may be of interest. Owing to the late date at which the test was held, it is impossible to work up the test in more detail, but the data given show 'the average performance of ~the ma- chinery during this run. Notes on Eight-Hour Endurance Test, Coal consumption was measured by leveling bunkers before and after test, and estimating the weight from the cubical contents, the weight per cubic foot being determined from samples. Feed water was run through a hot water meter and measured, and the meter afterwards calibrated. The make-up feed which measured the steam consumption of the auxiliaries was also metered, and this reading, de- ducted from the total water used, gave the steam consumption of the main turbines. -- Pressures at the nozzle were meas- ured by a Pitot tube held in the stream, © and - the discharge computed from the equation: Where Q 99 Diy P Q = Discharge in U. S. gallons per 'minute. D= Diameter of nozzle in inches. P= Pressure reading of Pitot tube in pounds. The summary of the test follows :-- IM ee Oct. 28, 1908. TNRGen OF sun 8. i 8° hours. ER OUNELOE oe ee ek ks a ee 29 537 ORO. me 2.--DESIGN FOR A TWO PUMP BOAT, PISTON TEMPERATURES, Degrees. External "air: ens eek ers ee cos wines cies yc 50 HneinefoOm = 3. a ee eae eee 54.8 Girculating- water, final ...--.0.0....+-. 75 'Circulating water, initial......-........ St (Circulating waters range ..+-+++++eeeeeee 25 Dry vacuum pump discharge........+... 131.3 Feed water, final 52.0 25% canine ne 164.0 Feed water; initial .......sc sess e eee ee 106.4 RAMGC F255 ee oe ee anes ae nae eet oe 57.6 REVOLUTIONS. Turbine, starboard ..--esseseeeeeeees 1,660 Turbine, DOLE is Se oor ere Coes tage 1,634 Circulating pump «-....----s eee e eens 285 Dry, vacuum Pump §..--- esse ees ee ress 123 Blower: engine 220+ --- teense eee nae 537 Strokes per minute (single Sitges): Hot-well. pump 22-0. ee see e es 133.6 Feed pump ....+---. a: Be eae 95.2 PRESSURES. --_- Boiler pressure,* starboard......... 156.8 Ibs. Boiler pressure, port. --+++++-+::0:° , 156.5 Ibs. Main steam at turbines, starboard.. tO. DS: Main steam at turbines, port........ 154.0 Ibs Condenser =vacwimseauge..scnbies tone; eat Draft gauge in fire room........ dei OBO Centrifugal fire pumps, starboard. .157.5., Pressures, pOrt .+--.eceeceresteees 57.0 Neean? ons cae ries wie ee anes 157.25 lbs Nozzle pressure, starboard...-.---- 101.3 Nozzle pressure, POrt +--++++++++++s 101.0 2 WiehH ot va nc ore ee ees 101.15 lbs Number of nozzles ..-+-es+sesererceecee 2 Diameter of nozzles .....--eeeeer crete a4 Gallons water discharged per nozzle peta: > tee aN te. ks oe base eo erecn ear aia ene ror be 4,808 nae La total poles discharge ea min-. po in ee ae aa Os 616 ealcus, total boiler discharge sex hour. 576, ee 'Water horsepower of pumps, each....:. 235 Water horsepower of pumps, _ MOtals ct ne fee (Coal burned, total IbS.. ---++-+eeseee res 26,500 Coal. burned, per hour, Ibs...-.---+++++ 3,310 \Coal burned, per square fdot. 'G. S. per hown. Abe icis nee ete) 28k 39.4 - Feed water, per hour, Ibe. esos bee 23,750 Make-up water, per POUL fe vip cs ec cee 2,205 Steam consumption-- S : Steam. turbines, Ibs..--+--+++2++++++" 21,544 *Boiler gauges are placed in engine room over switchboard. This would. probably. a er: for the small drop in' pressure between and turbines. PUMPS. Bile this 'tial was, made and.» the! foregoing results worked up. and» for: : warded | to the secretary, it was. -discov- ered that the impellers of. the» pumps: had been fitted too closely and were rubbing -badly and it has been found necessary to take them out and give them more clearance. "The figures given in the printed paper, therefore, for the B. H. P. of the turbines are' quite un- reliable and the actual B. H. P. was "un- doubtedly considerably more than the "amount stated. How much more it is impossible to say, as there is no way, of course, to determine what was the "increased resistance in the pumps caused a pie excessive friction of the impell- i may be stated, however, that all ioe sets for two boats--turbines, gen- erators and pumps--were thoroughly and carefully tested.at the works of the General Electric Co. at Schenectady be- fore shipment to Manitowoc, and that the water consumption per B. JH. P. worked out at. 15 8 pounds, and 'the ef- - ficiencies of 'the pumps varied from 70 'to 75 per cent. This was with a steam pressure of 160 lbs., vacuum 30 in., and --developed__B. H.. P. 675; and the steam was dry. "Inthe Manitowoc test the 'steam pressure and vacuum were slight- _ly- lower. and the moisture in the steam, determined by. calorimeters close to the -- *