. Radio for everybody; being a popular guide to practical radio-phone reception and transmission and to the dot-and-dash reception and transmission of the radio telegraph, for the layman who wants to apply radio for his pleasure and profit without going into the special theories and the intricacies of the art . to theproper binding posts of the receiver and amplifier late a number of B storage batteries have appearedon the market. It is claimed that the storage battery typeis more economical in the long run than the dry battery,and that it furnishes a more uniform and less noisy cur-r
. Radio for everybody; being a popular guide to practical radio-phone reception and transmission and to the dot-and-dash reception and transmission of the radio telegraph, for the layman who wants to apply radio for his pleasure and profit without going into the special theories and the intricacies of the art . to theproper binding posts of the receiver and amplifier late a number of B storage batteries have appearedon the market. It is claimed that the storage battery typeis more economical in the long run than the dry battery,and that it furnishes a more uniform and less noisy cur-rent, which is an important consideration in vacuum tubework. These batteries run about 22 or 24 volts per unit,and two units can be used for amplifier operation. Theycan be readily recharged, since their ampere hour capacityis 2 or less. 158 RADIO FOR EVERYBODY x\ll receiving sets and amplifier units are provided withjacks or binding posts for one pair of telephone the jack is used—the jack is simply a metal hole orsocket in which fits a plug fastened on to the cords of atelephone receiver—only one telephone receiver or headset can be used at a time. However, there has recentlyappeared on the market a multiple plug, which is insertedin the jack in the usual manner and which provides two. Vibrating type of rectifier and stepdown transformer outfitfor recharging storage batteries on the usual alternating cur-rent supply line. The vibrating reed, which appears under thehandle, rectifies both sides of the alternating current so thatdirect current is obtained. The volume of direct current isindicated by the ammeter. holes or jacks for two head sets or for a head set and aloud-speaker, each instrument being provided with theproper plug. Furthermore, there is also available a mul-tiple jack which may be mounted on an instrument or ona table near the instrument. The multiple jack presentsthree jacks all connected in series and so constructed thatone, two or three plugs
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Keywords: ., book, bookcentury1900, bookdecade1920, headphone, radio, transistor
