An elementary book on electricity and magnetism and their applications (1919)
Jackson, Dugald C. (Dugald Caleb), 1865-1951, Jackson, John Price, b. 1868, Black, Newton Henry, b. 1874 · New York, The Macmillian Co · leaf 473
he station, but soplaced that the operator has full view of all the machines hecontrols. By small signal lamps of different colors the operatorcan see at a glance what machines are running, what feedersare alive, and what switches are open. A control desk orbenchboard switchboard is frequently used… … Fig. 295. — Circuit breaker and plan of itsconstruction. POWER STATIONS AND DISTRIBUTION OF POWER 421 285. Lightning protection. Doubtless the earliest electricalinvention made in America was Benjamin Franklins lightningrod. We have still much to learn about atmospheric lightning,but it seems clear…
Electricity · Magnetism
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