The Elements of Mechanical Engineering, Τόμος 2Colliery Engineer Company, 1897 |
Άλλες εκδόσεις - Προβολή όλων
The Elements of Mechanical Engineering, Τόμος 5 International Correspondence Schools Πλήρης προβολή - 1897 |
The Elements of Mechanical Engineering, Τόμος 2 International Correspondence Schools Πλήρης προβολή - 1897 |
Συχνά εμφανιζόμενοι όροι και φράσεις
angle of advance ash pit axis beam belt bending moment carbon cast iron center line chimney circle clearance coal column combustion compression condenser cone connected connecting-rod crank crank-pin cross-head curve diagram diameter distance draw eccentric equal evaporation exhaust factor of safety feed-water feet fire flues foot-pounds force formula furnace gases gauge gear governor grate heat of vaporization Hence high-pressure cylinder horizontal horsepower inside lap lead screw length lever load low-pressure cylinder motion move number of revolutions pendulum governor pitch plate port opening position pound of steam pounds of water pounds per square pulley radius revolutions per minute riveted rocker rotation safety valve scale screw shaft shear shown in Fig side speed square inch steam pipe steam pressure steel stress stroke temperature tensile strength thickness tion tubes turn vertical volume water-tube boilers weight wheel width wrought iron
Δημοφιλή αποσπάσματα
Σελίδα 1092 - should be, as nearly as possible, the same at the end as at the beginning of the test. The steam pressure should be the same, the water-level the same, the fire upon the grates should be the same in quantity and condition, and the walls, flues, etc., should be of the same temperature. To secure as near an approximation
Σελίδα 630 - the cylinder. It is slightly less than the distance between the cylinder heads, since a small space must be left between the head and the piston, when the latter is at the end of its stroke. This space, together with the volume of the steam port, which leads to it, is called the clearance.
Σελίδα 609 - 200.575°. In many steam tables this column is left out, and the heat of the liquid is found for any temperature by subtracting 32° from the temperature. This method is usually exact enough for practical purposes. The heat required to raise the temperature of a pound of water from 32° to the boiling point is called the
Σελίδα 808 - of the moments of the forces which tend to turn the body in the opposite direction about the same point. Or, to state the principle more concisely, the opposing- moments about the point are equal. This is called the principle of moments. In the crank and connecting-rod mechanism, shown in outline in Fig. 354, the tendency of the force P to cause
Σελίδα 1092 - and as quickly as possible start a new fire with weighed wood and coal, noting the time of starting the test and the height of the water-level while the water is in a quiescent state just before starting the fire.
Σελίδα 883 - from a point on one tooth to a corresponding point on the next tooth, measured along the pitch circle, is the circular pitch. It is obtained by dividing the circumference (pitch circle) by the number of teeth, and is used in laying out the teeth of large gears, and also when calculating their strength.
Σελίδα 770 - the lower ones. In other words, when a cantilever is bent through the action of a load, the upper fibers are in tension and the lower fibers in compression. The reverse is the case in a simple beam in which the upper fibers are in compression and the lower fibers in tension. Further considerFlG.
Σελίδα 1090 - preparing for and conducting trials of steam boilers, the specific object of the proposed trial should be clearly defined and steadily kept in view. II. Measure and record the dimensions, position, etc., of grate and heating surfaces, flues, and chimneys; proportion of air space in the grate surface; kind of
Σελίδα 1091 - as a check on other measurements. For accurate work the water should be weighed or measured in a tank. 3. Thermometers and pyrometers for taking temperatures of air, steam, feed-water, waste gases, etc. 4. Pressure gauges,
Σελίδα 1090 - dust and ashes removed from back connections, leaks in masonry stopped, and all obstruction to draft removed. See that the damper will open to full extent, and that it may be closed when desired. Test for leaks in masonry by firing a little smoky fuel and immediately closing damper. The smoke will