James G. Biddle Company · Philadelphia : James G. Biddle · leaf 7
Providence, R. I. Roentgen Jumbo Coil with self-starting mechanical and electrolyticinterrupters ; operated from 250 v. direct current. Dr. Russell H. Boggs, Pittsburgh, Pa. Roentgen Jumbo Coil without interrupters; used with mercuryand electrolytic interrupters on no v. direct current Dr. Preston… … Roentgen Coil, with primary of variable inductance, self-starting mechanicalinterrupter, and adjustable mica condenser for same, mounted on plain table>with no volt rheostat beneath. The rheostat handle projects through top oftable and moves over a graduated scale. Woodwork, oak or mahogany.…
X-rays · Radiography
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