Creosoted Timber: Its Preparation and Uses (Google eBook)

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the Heywoods, 1900 - Building materials - 92 pages
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Page 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...
Page 64 - Doubling the diameter of a pipe increases its capacity four times. Friction of liquids in pipes increases as the square of the velocity.
Page 56 - SCANTLING shall show three corners heart free from injurious shakes or unsound knots. PLANK, nine inches and under wide shall show one heart face and two-thirds heart on oppo'site side, over nine inches wide shall show two-thirds heart on both 'sides, all free from round or through shakes, large or unsound knots. DIMENSION SIZES. — All square lumber shall show two-thirds heart on two sides, and not less than one-half heart on two other sides.
Page 51 - All oil shall be the heavy or dead oil of coal tar, containing not more than ij4 per cent of water, and not more than 5 per cent of tar, and not more than 5 per cent of carbolic acid. It must not flash below 185° F. nor burn below 200° F. and it must be fluid at 118° F. It must begin to distill at 320° F. and must yield between that temperature and 410° F. of all substances, less than 20 per cent by volume. Between 410 and 470° F. the yield of naphthalene must be not less than 40 nor more than...
Page 56 - All square lumber shall show two-thirds heart on two sides, and not less than onehalf heart on two other sides. Other sizes shall show two-thirds heart on faces and show heart twothirds of length on edges, excepting when the width exceeds the thickness by 3 inches or over, then it shall show heart on the edge for one-half the length.
Page 65 - To find the diameter of a pump cylinder to move a given quantity of water per minute (100 feet of piston being the standard of speed), divide the number of gallons by 4, then extract the square root, and the product will be the diameter in inches of the pump cylinder. To find the quantity of water elevated in one minute...
Page 65 - ... by the height in feet and divide the product by 33,000 (an allowance of 25 per cent, should be added for water friction, and a further allowance of 25 per cent, for loss in steam cylinder).
Page 33 - If this step of the operation is conducted at too low a temperature, or for too short a time, the sap or liquid part nearest the surface will only be extracted, the consequence of which will be an insufficient space for receiving the preservative. If, on the other hand, the operation...
Page 65 - ... 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.
Page 51 - The chamber being again emptied of all sap and water the oil is to be admitted, the vacuum pump being worked at its full speed until the chamber is filled with oil. As soon thereafter as is practicable such a pressure shall be set up as shall cause the entire charge of timber to absorb . . . pounds of oil within . . . per cent more or less (at a minimum penetration of...

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