A Treatise on Refrigerating and Ice-making Machinery ...Colliery Engineer Company, 1899 |
From inside the book
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Page 65
... Find the Logarithm of a Number Not Having More Than Four Figures . - Find the first three signifi- cant figures of the number whose logarithm is desired , in the left - hand column ; find the fourth figure in the column at the top ( or ...
... Find the Logarithm of a Number Not Having More Than Four Figures . - Find the first three signifi- cant figures of the number whose logarithm is desired , in the left - hand column ; find the fourth figure in the column at the top ( or ...
Page 66
... Find the mantissa corresponding to the logarithm of the first four figures , and subtract this mantissa from the next greater mantissa in the table ; the remainder is the difference . III . Find in the secondary table headed P. P. a ...
... Find the mantissa corresponding to the logarithm of the first four figures , and subtract this mantissa from the next greater mantissa in the table ; the remainder is the difference . III . Find in the secondary table headed P. P. a ...
Page 67
... Find the num- ber corresponding to this logarithm , and the result will be the number sought . Art . 647 . DIVISION BY LOGARITHMS . Rule . To divide one number by another by means of log- arithms , subtract the logarithm of the divisor ...
... Find the num- ber corresponding to this logarithm , and the result will be the number sought . Art . 647 . DIVISION BY LOGARITHMS . Rule . To divide one number by another by means of log- arithms , subtract the logarithm of the divisor ...
Page 79
... FIND THE AREA OF A THEORETICAL DIAGRAM AND THE WORK REPRESENTED BY THE DIAGRAM . Let A , P1 V1 = total area of diagram in square inches ; initial pressure measured in inches ; volume at cut - off measured in inches ; L = work in foot ...
... FIND THE AREA OF A THEORETICAL DIAGRAM AND THE WORK REPRESENTED BY THE DIAGRAM . Let A , P1 V1 = total area of diagram in square inches ; initial pressure measured in inches ; volume at cut - off measured in inches ; L = work in foot ...
Page 81
... FIND THE WEIGHT OF A FLY - WHEEL . Let V the greatest velocity of the crank - pin in ft . per sec . ; 1 = V1 = the least velocity of the crank - pin in ft . per sec .; V1 = average velocity of crank - pin in ft . per sec .; 0 W required ...
... FIND THE WEIGHT OF A FLY - WHEEL . Let V the greatest velocity of the crank - pin in ft . per sec . ; 1 = V1 = the least velocity of the crank - pin in ft . per sec .; V1 = average velocity of crank - pin in ft . per sec .; 0 W required ...
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Common terms and phrases
1-inch pipe 24 hours A₁ absolute temperature abstracted from cold ADIABATIC EXPANSION clearance coil cold body compression compressor condensing water corresponding Cosine Sine Cosine Cotang Tang Cotang crank-pin in ft cubic feet cubic foot cut-off denote the weight direct-expansion system expansion cylinder following formula foot-pounds heat absorbed heat abstracted heat delivered heat given heat of vaporization horsepower ice-melting capacity latent heat leaves the condenser logarithm machine mantissa number of revolutions p₁ V₁ P₂ piston pound of steam pounds per square pressure in pounds PV log Q₁ Q₂ quantity of brine ratio of expansion refrigerating capacity refrigeration required revolutions per minute s₂ Sine Cosine Sine Specific Gravity specific heat square inch strokes per minute superheated t₁ t₂ Tang Cotang Tang tons of refrigeration total heat V₂ velocity volume and pressure volume in cubic w₁ W₂ weight in pounds ΙΟ
Popular passages
Page 63 - W= weight of body at the surface; w = weight of a body at a given distance above or below the surface ; d= distance between the center of the earth and the center of the body ; R = radius of the earth = 4,000 miles.
Page 61 - To Divide One Number by Another, Subtract the logarithm of the divisor from the logarithm of the dividend, and obtain the antilogarithm of the difference.
Page 59 - X 10") - 3.8156. If the number is less than 1, the characteristic is negative and is numerically one greater than the number of zeros immediately following the decimal point. To avoid having a negative integral part and a positive decimal part, the characteristic is written as a difference.
Page 59 - For a number wholly decimal, the characteristic is negative, and is numerically one greater than the number of ciphers between the decimal point and the first digit of the decimal.
Page 66 - Law. — The temperature remaining the same, the volume of a given quantity of gas varies inversely as the pressure.
Page 59 - Law of Sines — In any triangle, the sides are proportional to the sines of the opposite angles. That is, sin A = sin B...
Page 61 - Multiply the logarithm of the number by the exponent which denotes the power to which the number is to be raised, and the result will be the logarithm of the required power. EXAMPLE. — What is the square of (a) 7.92 ? (6) the cube of 94.7? (<-) the 1.6 power of 512. that is, 5121-* ? SOLUTION.— (a) Log 7.92 = .89873; the exponent of the power is 2.
Page 24 - I .57381 .81899 .58802 .80885 .60205 .79846 .6.589 .78783 .62955 .77696 59 2 .57405 .81882 .58826 .80867 .60228 .79829 .61612 •78765 .62977 .77678 58 3 .57429 .81865 .58849 .80850 .60251 .79811 .61635 •78747 .63000 .77660 57...
Page 20 - ... •93979 I 60 .27564 .96126 •29237 •95630 .30902 .95106 .32557 .94552 .34202 •93969 0 / Cosine Sine Cosine Sine Cosine Sine Cosine Sine Cosine Sine...
Page 77 - ... however, it is more convenient to reject the air into the cooler D and draw the fresh supply from the atmosphere, which has a much higher temperature. In this case, it is evident that the air does not return to its original state in the cooler, and the cycle is not closed. 1345. General Theory. — In the following discussion, it will be assumed, for the sake of simplicity, that compression and expansion are adiabatic and that the air is drawn into the compressor from the cooling chamber, so...