The student's hand-book of forensic medicine and medical police / by H. Aubrey Husband.

  • Husband, H. Aubrey (Henry Aubrey)
Date:
1883
Catalogue details

Licence: Public Domain Mark

Credit: The student's hand-book of forensic medicine and medical police / by H. Aubrey Husband. Source: Wellcome Collection.

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    Ventilation in Collieries. U80 + T/ C = length of downcast column. c=length of upcast column. T=number of degrees in excess of 32° F. in C. t=number of degrees in excess of 32° F. in c. The storage of water. p = number of days' supply to be stored. F=mean rainfall in inches for three consecutive dry years. To calculate quantity of rain intercepted by rain gauge. Multiply the area of gauge by 252*458, divide product by 437'5 ; the result is the weight in ounces of one inch depth of rain over area of gauge. 252 -458=weight in grains of 1 cubic inch of water at 62° F. 437'5= of 1 ounce avoirdupois. „ ax 252*458 w= 437*5 w=water in ounces, a=area of gauge. Results of the combustion of coal gas. The combustion of 100 feet of coal gas destroys the oxygen of 800 cubic feet of air, and raises the temperature of 31*290 cubic feet of air 100° F. Results of the combustion of coal. The combustion of 1000 tons of coal will send about 15 tons of sulphur into the air as sulphurous acid. The coal consumed in Glasgow and its vicinity is said to give off about 300,000 tons of sulphuric acid annually. In London 5,000,000 tons of coal are burnt every year, equal to 75,000 tons of sulphurous acid. Radient heat. Kadient heat does not sensibly warm the air through which it passes, but bodies which intercept the rays of heat become warm, and impart their heat to the air around them. This is true of high temperatures, but with more moderate temperatures the heat is nearly equally divided between the walls and the air. If we therefore wish to warm the walls of a room and thus remove their moisture, stove pipes at a high temperature must be used. The reason that a person feels cold in a room in which a fire has just been lighted, is due to the act that the heat from his