Morrison's Practical Engineer and Mechanics' Guide: Containing a Glance at the Early History of Steam ...

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butterfield, 1887 - 172 Seiten
 

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Seite 65 - To find the pressure in pounds per square inch of a column of water, multiply the height of the column in feet by .434. Approximately, we say that every foot elevation is equal to % Ib. pressure per square inch ; this allows for ordinary friction. To find the diameter of a pump cylinder...
Seite 65 - The area of the steam piston, multiplied by the steam pressure, gives the total amount of pressure that can be exerted. The area of the water piston, multiplied by the pressure of water per square inch, gives the resistance. A margin must be made between the power and the resistance to move the pistons at the required speed— say from 20 to 40 per cent., according to speed and other conditions.
Seite 137 - Now, an ordinary-sized man can train himself to cover one yard at a stride, on the average, with sufficient accuracy for ordinary purposes. To make use of this means of measuring distances, it is essential to walk in a straight line; to do this, fix the eye on two objects in a line straight ahead, one comparatively near, the other remote; and, in walking, keep these objects constantly in line. Farmers and others by adopting the following simple and ingenious contrivance, may always carry with them...
Seite 113 - Repeat these movements deliberately and perseveringly, fifteen times only in a minute. (When the patient lies on the thorax, this cavity is compressed by the weight of the body, and expiration takes place. When he is turned on the side, this pressure is removed, and inspiration occurs.) 6th. When the...
Seite 16 - The Terminal Pressure is the pressure above the line of perfect vacuum that would exist at the end of the stroke if the steam had not been already released.
Seite 76 - For main belts working on very large pulleys, the distance should be 25 to 30 feet, the belts working well with a sag of 4 to 5 inches. If too great a distance is attempted, the weight of the belt will produce a very heavy sag...
Seite 75 - RULE. — Multiply the diameter of the driver by its number of revolutions, and divide the product by the number of revolutions of the driven : the quotient will be its diameter.
Seite 136 - To find the head which will produce a given velocity of water through a pipe of a given diameter and length : Multiply the square of the velocity, expressed in feet per second, by the length of pipe multiplied by the quotient obtained by dividing 13.9 by the diameter of the pipe in inches, and divide the result obtained by 2,500. The final amount will give the head in feet. Example.- — The horizontal length of pipe is 1,200 feet, and the diameter is 4 inches.
Seite 163 - The space for this calculation occupies from ten at night till two next morning. 3. The nearer to mid-day or noon these phases of the moon happen, the more foul or wet the weather may be expected during the next seven days. 4. The space for this calculation occupies from ten in the forenoon to two in the afternoon. These observations...
Seite 76 - Circumstances, generally, have much to do with the arrangement, and the engineer or machinist must use his judgment, making all things conform, as far as may be, to general principles. This distance should be such as to allow of a gentle sag to the belt when in motion. A general rule may be stated thus : Where narrow belts are to be run over small pulleys, 15 feet is a good average, the belt having a sag of iJ to 2 inches.

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