Cyclopedia of heating, plumbing and sanitation; a complete reference work . pipe and in contact with the upper half of its surfaceis at a considerably higher temperature than the main body of waterin the tank; therefore, with natural circulation, it is well to make ampleallowance for the effed of this skin of warm water surrounding thesteam coils, and to assume that they will not give off more than § asmuch heat as that corresponding to the difference in temperature be-tween the steam and the water in the tank, based on 100 heat units perdegree difference as stated above. In other words, allow
Cyclopedia of heating, plumbing and sanitation; a complete reference work . pipe and in contact with the upper half of its surfaceis at a considerably higher temperature than the main body of waterin the tank; therefore, with natural circulation, it is well to make ampleallowance for the effed of this skin of warm water surrounding thesteam coils, and to assume that they will not give off more than § asmuch heat as that corresponding to the difference in temperature be-tween the steam and the water in the tank, based on 100 heat units perdegree difference as stated above. In other words, allow only 00-1—or, in round numbers, 70—heatunits per hour per degree difference in temperature between the steamand the water in the tank. If the difference in temperature is l?:^)0—70° = 160°, on thebasis stated, one square foot of coil would give off 70 X 160 = 11,200heat units per square foot per hour; and since 600,000 heat units mustbe supplied to the water, a 53-square foot coil or slightly larger wouldbe required, equal to about 122 ft. of lj-inch pipe. 288. SIMPLE COMBINATION GAS AND ELECTRIC FIXTURE IN A DINING ROOM ELECTRIC WIRING METHODS OF WIRING The different methods of wiring which are now approved by theNational Board of Fire Underwriters, may be classified under fourgeneral heads, as follows: 1. Wires Run Concealed in Conduits. 2. Wires Run in Moulding. 3. Concealed Knob and Tube Wiring. 4. Wires Run Exposed on Insulators. WIRES RUN CONCEALED IN CONDUITS Under this general head, will be included the following: (a) Wires run in rigid conduits. (?>) Wires run in flexible metal conduits. (c) Armored cable. Wires Run in Rigid Conduit. The form of rigid metal conduit nowused almost exclusively, consists of plain iron gaspipe the interior sur-face of which has been prepared by removing the scale and by remov-ing the irregularities, and which is then coated with flexible outside of the pipe is given a thin coat of enamel in some cases,and, in otherc
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