United States. Surgeon-General's Office, American Roentgen Ray Society · New York : Middleditch · leaf 51
s the line marked F at the 4-inch gap. Hence wemust use button F. Have spark gap at seven inches andforget it entirely. Move rheostat lever to F, look atyour milliammeter, use one hand on transformer pri-mary switch and the other on the Coolidge control. Closetransformer switch and bring filament… … Fig 15 Partial chart of a particular machine with rheostat [control.Note that gap change as tube current increases is very rapid. On G, for example,we have a 6 inch gap at 25 M.A. and only a 3 inch gap at 27.5 M.A. or a changeof an inch for each 2y2 M.A. Compare with Fig. 16. Gap 6 (ifKhti) 5432 ,…
