# Appleton's Dictionary of Machines, Mechanics, Engine-work, and Engineering, Volume 1

D. Appleton, 1873

### Popular passages

Page 493 - To shew that the resultant thrust on any plane surface under fluid pressure is equal to the weight of a column of the fluid whose base is the area of the surface and whose height is the depth of the centre of gravity of the surface.
Page 427 - Multiply the square of the diameter of the cylinder in inches by the length of the stroke in inches, and by 171; and divide the product by the diameter of the driving-wheels in feet.
Page 460 - B thus found as a centre with the radius BA, describe a portion of a circle intersecting perpendiculars drawn from C and D, the extremities of the line which represents the throw of the valve ; from those points in the circumference of the circle produce lines through the centre B. On either side of the centre line AE, and at a distance from it equal to the radius of the eccentric, draw a parallel line. From B as a centre, with the distance from the centre B to the points HK, — in which the parallels...
Page 461 - In this case the centres of the eccentric pulleys must, consequently, be moved downwards as many degrees as the central line. In order to facilitate this adjustment, we may briefly explain, that every circle is supposed to have its circumference divided into 360 equal parts, called degrees ; and if two diameters be drawn in it at right angles to each other, they will divide the circumference into four equal parts, each of which contains 90 degrees. This, therefore, is the means by which the angle...
Page 381 - ... the distance of 300 feet; and from all the experiments it was concluded that the distance might be indefinitely increased, provided the wires were lengthened in a corresponding ratio. That the same effect is produced by the repulsive action of the electrical discharge in the heavens is shown by the following modification of the foregoing arrangement. One of the wires was removed and the other so lengthened at one end as to pass into my study and thence through a cellar window into an adjacent...
Page 111 - ... the maximum economical evaporation, in feet of water per foot of grate per hour, h was the total heating surface in square feet, measured inside, and g was the grate-area in square feet...
Page 111 - ... contended thence, that the heating surface would be economically weakened by an extension of the grate, and would be strengthened by its reduction ; and that whereas large grates were commonly thought to be an unmixed good, and being generally recommended were usually adopted ; still they might be made too large ; not that their extension affected the quality of combustion, but that the economical evaporative power might be reduced. Concentrated and rapid combustion was, alike, the true practice...
Page 502 - The steam enters by pipe/, and as the cylinders are running in contact, it cannot escape between them, but acts upon the two wings in opposite directions, and escapes at the eduction pipe g, after the said wings have passed the same. By reference to fig. 8, which represents a longitudinal section, it will be seen that...
Page 145 - ... motion, drags the harrow, which forces its way into the soil, admits the water into it, and by tearing and separating the particles, not only mixes the ingredients, but also affords an opportunity for stones and other heavy matters to fall to the bottom. Fresh clay, chalk, and water, continue to be added until the recess is full. On one side of the recess, and as near it as possible, several hollow square pits are prepared about 18 inches or 2 feet deep. The soil, reduced to a kind of liquid...
Page 174 - Printing b;i steam, a style in which a mixture of dye extracts and mordants is topically applied to calico, while the chemical reaction which fixes the colors to the fibre is produced by steam. 8. Spirit colors, produced by a mixture of dye extracts and a solution of tin.