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In order to facilitate the portability of the A O "giantscope," the following arrangement has been found satisfactory. A transformer, providing 6.3 volts and 1.2 amperes, which is small enough to fit into the original box is installed. This is connected with alternating current by means of an extension cord. The "giantscope" with its cord is connected to the transformer by means of two plugs. This arrangement works well with alternating current. A satisfactory resistor with respect to size has not as yet been devised for use with direct current.
GOFF JL. TRANSFORMER FOR THE A O "GIANTSCOPE". Arch Ophthalmol. 1950;43(3):553. doi:10.1001/archopht.1950.00910010562016