Chicago : [Popular Engineering Pub. Co.] · leaf 880
e trolley, we have two, for three- depth greater phase current has to have three paths to than that at travel. which divers The direct current system is by far the c an work. most commonly used in this country. Next Then ordinary comes the single-phase, and after that the methods fail three-phase,… … the wreck is not in too deep water. ELECTRICALLY EQUIPPED DIVING BELL
Electricity
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
