given voltage, is the subject lirely faultless. What is known as the “hairpin” their smaller ends with a transmitter having a mouth. of the patent granted to Mr. Hanks. The adaptability filament, the first form ever used, varied but slightly A throat leads from the mouth to the diaphragm in its… … A device by which this change is at all times readily MENT COMPARED WITH ONE OF THE “ HAIRPIN” accomplished is shown in the accompanying cut. The TYPE. lamp is provided with about ten feet of flexible cord, vocal or instrumental, is reproduced by this new and mounted on a spring roller which locks…
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