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Q. Can you tell the duty of an engine when you know its consumption of coal per horse power per hour? A. Yes, if the power given be the actual, and not the nominal, power. Divide 166.32 by the number of pounds of coal consumed per actual horse power per hour; the quotient is the duty in millions of pounds.
It is also observable, that the number of changes that may be rung on nine bells, is 362,880; which figures added together, make 27; that is, 2 plus 7 = Nine. And the quotient of 362,880, divided by 9, will be 40,320; that is, 4 plus 0 plus 3 plus 2 plus 0 = Nine.
A. The diameter of the rolling circle is very easily found, for we have only to divide 5,280 times the number of miles per hour, by 60 times the number of strokes per minute, to get an expression for the circumference of the rolling circle, or the following rule may be adopted: divide 88 times the speed of the vessel in statute miles per hour, by 3.1416 times the number of strokes per minute; the quotient will be the diameter in feet of the rolling circle.
This ratio is preserved by the following rule: multiply the capacity of the cylinder in cubic inches by the total pressure of the steam per square inch, or the pressure on the safety valve plus 15, and divide the product by 200. The quotient is the proper capacity of the cold water pump in cubic inches when the engine is double acting, and the pump single acting.
The area of port which it appears advisable to give to modern engines of every description, is expressed by the following rule: multiply the area of the cylinder in square inches by the speed of the piston in feet per minute, and divide the product by 4,000; the quotient is the area of each cylinder port in square inches.
If the average rate of wages at any particular time was merely the quotient obtained by dividing the number of laborers into the wages fund, an organized effort to change the rate of wages would necessarily be a failure, or could at most only result in driving some other laborers out of employment or reducing their wages.
Having no interest in any certain property, the foresters of the Nanticoke would rather trade with the enemy than fight for foolish ideas; and so this region was more than half Tory, and is still half passive, the other half predatory. To neither half of such a quotient belongs the house of Isaac and Jacob Cannon!"
The quotient the multiplicand That the knaves should have gone out this blessed minute! the acceleration being at the rate of 5 minutes, 55 seconds, 53 thirds, 59 fourths I will switch them both when they come back I will, by the bones of the immortal Napier!"
A. If the force acting at the end of an engine beam be taken at 18 lbs. per circular inch of the piston, then the force acting at the middle will be 36 lbs. per circular inch of the piston, and the proper strength of the beam at the centre will be found by the following rule: divide the weight in lbs. acting at the centre by 250, and multiply the quotient by the distance between the extreme centres.
To determine the thickness when of wood, multiply the square of the diameter of the cylinder in inches by the length of the stroke in feet, and divide the product by 24. Extract the fourth root of the quotient, which is the thickness in inches. For iron the rule is the same, only the divisor was 57.6 instead of 24. Q. What are the dimensions of the end studs of a land engine beam?
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