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Download Automatic and Concealable Firearms Design Book, Volume 3 by Editors of Paladin Press Books PDF

By Editors of Paladin Press Books

ISBN-10: 0873642244

ISBN-13: 9780873642248

The name speaks for itself.

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Extra info for Automatic and Concealable Firearms Design Book, Volume 3

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Refrigeration Capacity Measurements The cooling effect is measured by a unit known as a ton of refrigeration. A ton of refrigeration is obtained when 1 ton (2000 lb) of ice at 32◦ F is melted to water at 32◦ F in 24 hours. If it is remembered that the latent heat of fusion is 144 Btu/lb, it follows that the ton represents a unit cooling effect of 144 × 2000, or 288,000 Btu/24 hr, 12,000 Btu/hr, or 200 Btu/min. Thus, for air-conditioning PSYCHROMETER SLIDE RULE 30 70 60 50 40 50 40 20 30 10 40 50 10 60 40 10 70 40 80 50 90 60 100 70 10 60 30 60 709080 10 90 100 80 70 20 10 0 Air-Conditioning Fundamentals 11 Figure 1-3 Sling psychrometer.

This tube Air-Conditioning Fundamentals 9 was inverted in a cup partially filled with mercury, as shown in Figure 1-2. The height of the mercury column in the tube is a measure of the existing atmospheric pressure. 92 IN MERCURY TUBE ATMOSPHERIC PRESSURE MERCURY BOWL Figure 1-2 Method of obtaining barometric pressure. 921 inches of mercury. Most of the pressure gages used in engineering calculations indicate gage pressure, or pounds per square inch (psi). 49116. 696 psi. 696 psi. Sling Psychrometer Relative humidity is measured by an instrument known as the sling psychrometer, which uses two mercury thermometers mounted side by side (see Figure 1-3).

Pressure Gages Pressure gages, as the name implies, are used for pressure measurements on refrigeration systems as a means of checking performance. Gages for the high-pressure side of the system have scales reading from 0 to 300 pounds per square inch gage (psig), or for higher pressures, from 0 to 500 psig (Figure 1-4). Gages for the low-pressure part of the system are termed compound gages since their scales are graduated for pressures above atmospheric pressure in pounds per square inch gage and for pressures below atmospheric pressure (vacuum) in inches of mercury.

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Automatic and Concealable Firearms Design Book, Volume 3 by Editors of Paladin Press Books

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