Encyclopedia of Engineering: A Treatise on Boilers, Steam Engines, the Locomotive, Electricity, Machine Shop Practice, Air Brake Practice, Engineer's Catechism, Gas, Oil, Traction and Automobile Motors, Refrigeration, Etc., Etc, المجلد 5

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International School of Engineering, 1906
 

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الصفحة 187 - 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...
الصفحة 217 - If she move it from left to right, or in the direction of the hands of a watch, you may trust her; if the other way, she is certain to be stupid and incapable.
الصفحة 186 - To find circumference of a circle, multiply diameter by 3.1416. To find diameter of a circle, multiply circumference by .31831. To find area of a circle multiply square of diameter by .7854. To find area of a triangle, multiply base by one-half the perpendicular height.
الصفحة 187 - ... of coal to 1 gallon of water. One-sixth of tensile strength of plate multiplied by thickness of plate and divided by one-half the diameter of boiler gives safe working pressure for tubular boilers. For marine boilers add 20 per cent for drilled holes. No plate or bars of either steel or iron should be worked at a black or blue heat (say about 500°) ; the material will stand far more strain...
الصفحة 402 - I, as the pitch diameter is equal to the number of teeth divided by the diametral pitch, then 20 divided by 5 equals 4, as the required pitch diameter in inches. What is the outside diameter of the same gear? From Formula No.
الصفحة 325 - J4 to l/2 or ~y\ inch, being naturally larger the larger the engine. The clearance volume or the percentage clearance on the other hand is the actual volume contained between the face of the valve and the face of the piston when the latter is at the end of the stroke plus the volume of the steam port...
الصفحة 303 - The standard of horsepower is the amount of energy that will raise a weight of 33,000 pounds one foot high in a minute, or 550 pounds one foot high in one second. An engine or motor exerting one actual horsepower will raise a weight of 10 pounds 3,300 feet in one minute, but will require 10 minutes to raise 330,000 pounds one foot high.
الصفحة 301 - The exhaust-valve cam shaft on a four-cycle motor is usually driven by the two to one gear on the crank shaft, and if for any reason the gears are taken apart and put together, even if only one tooth is out of place, it will throw the valve and spark mechanism out of time.
الصفحة 176 - Let the steam outlets remain as they are. 3. In Case of Foaming. — Close throttle, and keep closed long enough to show true level of water. If that level is sufficiently high, feeding and blowing will usually suffice to correct the evil. In case of violent foaming, caused by dirty water, or change from salt to fresh or vice versa, in addition to the action above stated, check draft and cover fires with fresh coal.
الصفحة 187 - A cubic foot of water contains "]\ gallons, 1728 cubic inches, and weighs 62| pounds. To find the pressure in pounds per square inch of a column of water multiply the height of the column in feet by .434. Steam rising from water at its boiling point (212...

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