Crystal Palace International Electric Exhibition 1881-82

89 been turning, say, 250 horse-power, as, during the experiments, it was much under-loaded. The following are some of the advantages of the “ Galloway ” patent engine : (1) Direct passage between high and low pressure cylinder; (2) Independent exhaust valves; (3) All valves on the flat slide principle and of improved construction; (4) Instantaneous cut-off, controlled automatically by improved governor; (5) Simplicity of general arrangement and few working parts. The form of boiler used at the Crystal Palace was also supplied to the Philadelphia Exhibition of 1876, where it (also 12 others), was officially tested by the American authorities. The test was made under ordinary working conditions, the pressure being maintained at 701b. to the square inch ; the result was that the “ Galloway” boiler evaporated 11’72 lb. of water at 212° Fahrenheit per pound of combustible, which was the highest duty obtained from any of the boilers; and in addition to this the “ Galloway” boiler was ascertained by careful calorimeter experiments to give the driest steam—a point of great importance in the working of steam-engines. The advantages claimed for the “ 1875” patent are : (1) Stronger back Hue, owing to the tubes being brought close together at their lower ends; (2) All tubes interchangeable, thus ensuring mathematical exactness in putting together; (3) Avoiding all bevel flanches o£ the tubes, which have always been an objec- tionable feature; (4) Allowing more space for cleaning and examination, of the undei’ side of flue; (5) Introducing the con- tracting pockets at back end of the flue, thus relieving the end plates of strains caused by unequal expansion. Avenue between Entertainment Court and Sheffield Court. 355a.—John & Henry Gwynne, Hammersmith. IronWorks, London. No. 1. “ Invincible” Direct-Acting High-Speed Vertical Engine, coupled to spindle of and combined with, one Siemens’ D2 Dynamo Electric Machine and one Siemens’ S Dg Machine ; engine makes 700 revolutions per minute, provides 9 to 10 actual horse-power, the dynamo machines worked by it maintain one Siemens* arc lamp of 7,000 candle-power and five Siemens’ arc lamps of 1,000 candle-power each. No. 2. “ Invincible ” Direct-Acting High-Speed Horizontal Engine, combined and coupled directly with one Siemens’ W„ Alternate Current Machine and one D7 Exciter for same; engine makes 800 revolutions per minute, pro- vides 10 to 12 actual horse-power, the dynamo machine worked by it maintains six Siemens’ differential arc lights and 75 incande- scent lamps. No. 3. “ Invincible ” Horizontal Engine, running 280 revolutions per minute, provided with, special bearing to carry properly heavy fly-wheel, and driving by straps one Siemens’ Wj Alternate Current Machine and one D7 Exciter for same; engine makes 280 revolutions per minute (but will run at about double the speed); W7 machine makes 700 and I)7 Exciter 1000 revolutions per minute; actual horse-power provided; at 280 revo- lutions, 25 ; the Alternate Current Machine maintains 200 Swan incandescent lamps. No. 4. Invincible ” High-Speed Engine, similar in all respects to No. 3, but arranged vertically ; drives one Siemens’ Wx Alternate Current Machine and one Siemens’