. Popular electricity magazine in plain English. ed to be the mostmagnificent electric sign on the PacificCoast. THE PHONOPHORUS—LATEST AID TOTHE DEAF Attempts have frequently been madeto design, on the telephone principle, someapparatus enabling those partly deaf tohear more distinctly. The latest in-strument of this type has been developedby the famous German firm of Siemens& Halske, who have attempted in par-ticular to obviate the crackling or hissingnoises in the receiver and secure puresound transmission and absolute dis-tinctness. A special point was made ofgiving the new appara-tus, or
. Popular electricity magazine in plain English. ed to be the mostmagnificent electric sign on the PacificCoast. THE PHONOPHORUS—LATEST AID TOTHE DEAF Attempts have frequently been madeto design, on the telephone principle, someapparatus enabling those partly deaf tohear more distinctly. The latest in-strument of this type has been developedby the famous German firm of Siemens& Halske, who have attempted in par-ticular to obviate the crackling or hissingnoises in the receiver and secure puresound transmission and absolute dis-tinctness. A special point was made ofgiving the new appara-tus, or Phonophorus,as it is called, a form asconvenient and incon-spicuous as possible, soas to facilitate its use. All the different typesof Phonophorus brought contact. All apparatus also comprises afolding head gear. The apparatus for moderately intensesound reproduction comprises a simplemicrophone and single receiver, the for-mer being fitted with a small hook bymeans of which it can be hung up from abutton or loop of the users clothes. The. Small Set in a LadysHand Bag
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectelectri, bookyear1912
