Hallberg, Josef Henrik, 1874- · New York city, The Moving picture world · leaf 297
patronage by using direct-currentlamps on alternating current supply circuitswith a — WestinghouseCooper-Hewitt Rectifier It changes alternating current to direct current. Therectifier occupies little space and operates automatically.There are no moving parts—no machinery to get out oforder—no… … ESPECIALLY adapted to the making ofa perfect Direct Current for projectionwork. Made in sizes of 2, 4 and 10 kilo-watts, Direct-connected, comparativelylight, Durable and Economical. Either 60-65 or 110-115 volts. Our 125 page catalogue gives muchuseful information about IsolatedElectric Lighting…
Motion picture theaters · Electric lighting
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