The Steam Engine for Practical Men. ... Jointly Written by J. H. and P. and J. Gener

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Pàgina 7 - Divide that part of the stroke through which the expansion takes place, into any even number of equal parts, and calculate the pressure per square inch upon the piston at each division of the stroke ; take the sum of the extreme pressures in pounds per square inch, four times the sum of the even pressures, and twice the sum of the odd pressures ; multiply the sum of all these by...
Pàgina 5 - ... the number of units of work done upon each square inch of the piston, and the number of units of work gained by working expansively.
Pàgina 165 - Institution in its researches; but from the want of some practical facts which have transpired in the course of the experiments which I have made within the last twelve years, they have, as I believe, arrived at some conclusions entirely fallacious, and which will, if not controverted, tend to injurious consequences. The most dangerous of these conclusions is, that all the destructive explosions of steam boilers, have been caused by the direct pressure of the steam, and that there is no difference...
Pàgina 71 - ... four times in the revolution of the paddle wheels instead of twice. As relates to my improvements in propelling vessels, I do not lay claim to the use of paddle boards entering the water in a diagonal or feathering direction, that not being new, but I claim as my invention the making of about one half of them to enter the water in one diagonal direction, and the other half to enter it in the reverse diagonal direction or in large paddle wheels in making the boards to change their direction of...
Pàgina 170 - Mechanics, on the subject of beams. " In the construction of beams, it is necessary that their form should be such that they will be equally strong throughout. If a beam be fixed at one end, and loaded at the other, and the breadth uniform throughout its length, then, that the beam may be equally strong throughout, its form must be that of a parabola. This form is generally used in the beams of steam engines.
Pàgina 28 - Then take the natural series 1, 2, 3, fyc. up to the number of things to be taken at a time, and find the product of all the terms of this series. Divide the former product by the latter, and the quotient will be the answer. 1 . How many combinations of 3 letters can be made out of the 6 letters abcdef ? 2. How many different yoke of oxen may be selected from twelve oxen ? 3.
Pàgina 14 - ... the piston during one stroke. If the mean pressure on both sides of the piston, the length of the stroke, and the number of strokes per minute are known, the horsepower of the engine can be easily found.
Pàgina 71 - As the acting face of each board is radiating, it propels while passing under the centre in the ordinary way, and when it emerges, the water escapes simultaneously from each narrow board, and consequently cannot lop-up.
Pàgina 168 - ... taking care that it did not come in contact with the heated metal. The temperature thus indicated was invariably 205°.] Perhaps one of the most curious facts which have been established in connexion with this subject is, that any variation in the temperature of a vessel containing a spheroid, does not affect the temperature of the spheroid itself. Thus, it is found that a spheroid of water, when contained in a crucible heated considerably below redness, is just as hot as one contained in a crucible...
Pàgina 12 - ... is the product of force multiplied by the distance through which it acts. In the case of the engine cylinder, the total force is the MEP per square inch multiplied by the area of the piston; and the distance through which the force acts in 1 minute is the distance the piston moves in 1 minute, which is equal to the number of strokes per minute multiplied by the length of the stroke. Rule 4. — To find the indicated horsepower developed by the engine, multiply together the MEP per sq.

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