Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 240
ny coils as are neededto provide the required amount of heat. In other forms, the heatingmaterial is surrounded with fire-clay, enamel, or asbestos, and in somecases the material itself has been such as to give considerable resist-ance to the current. A form of electric car-heater is shown in Fig.… … H = Heat, in calories: / = Current, in amperes;R = Resistance, in ohms; t = Time, in seconds. Examples. AVhat resistance must anelectric heater have, to give oflf 6,000 B.T. U. per hour, with a current of 20 am-peres ? Fig. 164. Electric Radiator. AVe have learned that 1 B. T. U. = 252 calories;…
Architecture · Building · Carpentry
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