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There are contractors who specialize in this work and have equipment for doing the job quickly with minimum cutting and inconvenience. An electric fire detector in the cellar acts much like a burglar alarm. There are several now on the market. The principle on which they work is thermostatic. Sensitive to increased heat, an alarm bell sounds the moment fire develops.
Eight forms of electric lamps using infusible earthy oxides and brought to high incandescence in vacuo by high potential current of several thousand volts; same character as impingement of X-rays on object in bulb. A loud-speaking telephone with quartz cylinder and beam of ultra-violet light. Four forms of arc light with special carbons. A thermostatic motor.
"How do you do that?" "By pressing this button which will activate the servo units. They automatically keep the circulating pumps in operation, based on thermostatic readings from the main gauge." Tom pointed to a black clock face, with a luminous white hand and numbers. "All right, carry on," said Strong.
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