The Birmingham age-herald., 1915-04-24
The Long Distance Telephone

| When the long distance telephone con- pletion was celebrated recently by ir.- pressiye ceremonial and Dr. Bell demon- strated the perfect working of the appar- atus, reference was made to the highly valuable contribution to this latest devel- opment of long distance teephoning which
 John J. Carty, with the so-called phantom circuit, furnished. pr Hewitts apparatus 1 assured the triumph of the phantom cir | cult. By means of this apparatus, which 1 is a development of the vacuum tuhe the
 vibration or whatever the instrumentality
 may be by which the human voice is car | ried intelligibly over long distances and | through wire, relays, so to speak. thesa 3
 vibrations. For instance, at Pittsburs the apparatus infuses new strength into these vibrations. With this renewed strengt h | the phantom circuit is made available l from Pittsburg to Salt Lake City At that point. Mir. Hewitts apparatus again in- fuses renewed strength into the vibrations 1 and the mechanical invention of MT. | Carty, in connection with pr. Hewitt's ap-
 paratus, makes it possible to carry the | human voice unimpaired into San Fran cisco. That was a development of the vacuum tube of which Dr. Hewitt did not dream when he first began the experi- ! ments with the view of utilizing the tube l for the purpose of procuring new ana economic form of lighting.
 The rnagic-like features of Dr. Hewitt S 1 work in his laboratory cannot De ex- plained understandingy to laymen except | ing In general and untechnical terms. But it can be said that he has perfected now | an apparatus which he calls the pulsat tor, which turns the direct current into an
 alternating current, and it Is this appara |. tus, in all probability, which is vastly to ia ciiltate the commercial development of wireless teephoning. The United States
 government in constructing it's wireless apparatus has been using the arc system That system cngenders terrific heat and it is only by various artificial mthods that this heat is so controlled that the wireless apparatus can be utilized But pr Hewitts pulsator engenders no heat to speak of. It can be so adjusted that the
 most delicate and remote sounding tones can be emitted from the telephone and then by other and successive adjustments the telephone will emit musical sounds running up and down the scale. The tele- phone in pr. Hewitt's laboratory thus sends forth sounds to the amazement of the person who hears them.
 So also the apparatus will make it pos slble to communicate the human voice. The apparatus is attached to the ssndir z end of the wireless and receiving appar- atus will also be installed at that place. When Crooks perfected the vacuum tube he could not have realized how momen l. tous would be the scientific developments which 1t would make possible or what an important part 1t would take as an art as socated with material or commercial de- velopment. And although Dr. Hewitt has
 now demonstrated in three ways the com mercial value and the real art which tha vacuum tube identifies in addition lis
 first perfected invention. the mercury yaror lamp. nevertheless he now feels as-
 sured that science is only just beginning to show the way by which this apparatus may in future not distant play an irn-
 portant part in the development of al
 material art