Engineering Precedents for Steam Machinery: Embracing the Performances of Steamships, Experiments with Propelling Instruments, Condensers, Boilers, Etc., Accompanied by Analyses of the Same, Volume 2 |
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admission of air air through holes atmosphere back pressure Blackheath anthracite boiler pressure calorimeter centum ceteris paribus chimney clearance and port coal consumed commencement condensation consumed per hour cubic feet cubic foot cut-off valve cylinder degrees Fahr difference double strokes equal evaporative efficiency expanded steam experiments of April feed-water fuel furnace door geographical miles grate surface greater heating surface horizontal fire-tube boiler horses power inch above zero inches of mercury indicator diagrams leakage length loss mean effective pressure measure of expansion number of double number of pounds pound of coal pound of combustible Pounds of steam pounds of water pounds per square produce proportion quantity ratio rows sail screw Smithery space square feet square inch steam pressure steam room stroke of piston superheating surface condenser temperature Temperature in degrees throttling total heat Total number Trevorton vertical water-tube boiler waste in ashes weight of steam York Navy Yard
Popular passages
Page 188 - HULL. — Length on deck from fore part of stem to after part of stern post...
Page 37 - ... of the steam in the cylinder at the end of the stroke being compressed equal to or above the boiler pressure. This seems as original an idea as Parkes' percussion, and, if proved, not favourable to the latter.
Page 99 - Vd where d is the diameter of the cylinder. This example shows Drag of a Circular Cylinder that sudden and important changes in the drag coefficient of a body may occur as the Reynolds
Page 37 - One of the most important of these is the rapidity of combustion, which is ordinarily measured by the number of pounds of coal consumed per hour per square foot of grate surface, the average quantity of which in marine boilers may safely be taken at fifteen pounds. In Johnson's experiments, however, the consumption of Cumberland bituminous coal was at the rate of only 7 - ll pounds, and of anthracite 6-43 pounds; an average of less than half the practical rate of consumption.
Page 125 - ... and ours is obtained as follows: By the different construction of the boilers in the experiments made by Johnson from those now under consideration. * There are various losses of heat mainly by radiation and contact of air with the outside of the boiler. In considering the evaporation in Johnson's boiler there must be kept in view the very favorable circumstances under which it was obtained. Johnson's boiler was set in brick and expressly built for his experiments; the heated air was in contact...
Page vii - Department have been re- written, aJded to, and illustrated, and are now presented in a more convenient form for reference. The first paper describes the experiments made at the New York Navy Yard to determine the comparative evaporative efficiencies of the hard or) true anthracite, the Trevorton semi-anthracite, and the Cumberland semi-bituminous coals ; the three kinds in general use for steam vessel and laud engines on the Atlantic coast of the United States.
Page 63 - Eesults, and taking the mean of the third and fourth columns, it will be observed that the pressure of the steam in the cylinder at the point of cutting off...
Page 134 - Soilers for Window Shades. — I do claim the combination of India-rubber or equivalent substance with a window shade roller or its pulley, substantially as and for the purpose described. JB BAILEY. No. 544. — Improvement in Steam Boilers. — We claim, first, connecting the water legs, extending from the front to the rear end of the boiler, continuously to the shell of the boiler at the point of the greatest horizontal diameter of the boiler, substantially as herein set forth.
Page 56 - It results from the fact, that although the total heat of steam of higher pressure is greater than the total heat of steam of lower pressure, yet as the latent heat of the latter increases in a much higher ratio than its total heat diminishes, and as this increase in the latent heat is at the expense of the sensible heat, it becomes a cooling process and produces the condensation stated.
Page 25 - Assuming this law to hold for the expansion of steam, find the steam pressure at the end of the stroke of the piston in an engine where the steam is admitted at a pressure of 30 Ibs.