31(1 



THE TELEPHONOGRAPH. 



sand.s of times. It is said that a record has been reproduced 2,200 

 times and has still ])een very . perfect, and such a spool containing' a 

 record could be shipped across the country and placed on another 

 machine, and would reproduce the sounds which originally caused 

 the record with absolute perfection, and even a rusty Avire contain- 

 ing a record has been sandpapered and polished without affecting 

 appreciably the record. In fig. 5. letter D, is indicated, first, how 

 the steel band is magnetized by the obliterating magnet, then by 

 the varying field of the recording magnet, and finally by the reversal 

 in direction. The Poulsen telephonograph in its ordinary form 

 does not speak louder than an ordinary Bell telephone. 1 would 

 suggest the employment of Edison's " electro-motograph " or *" chalk" 

 telephone receiver, by means of which it could be made to speak 

 very loud. (An audience of 5,000 has been able to hear perfectly 

 this Edison's loud-speaking telephone.) Mr. Poulsen has suggested 

 a number of other methods by which the sound could be aug- 



fl£:C£/i"nO TSL£P/tOAl£. 



Fig. 4. — The talking newspaper. 



mented. It is claimed that by increasing the speed during reproduc- 

 tion, over that of the recording speed, the telephone speaks much 

 louder. This would, however, tend only to increase the pitch, and 

 not improve the volume of the sound. Other methods suggested 

 by Mr. Poulsen are indicated in fig. 5, letters A and C. They con- 

 sist in substance of methods for causing one transmitter to make a 

 number of records on separate steel wires or bands which, on repeat- 

 ing, cause the various reproducing magnets to simultaneously afl'ect 

 the one telephonic receiver. It has also been proposed to utilize the 

 telephonograph as a talking newspaper. In fig. 4 is shown a method 

 which it is proposed to employ. As the steel ribbon which, in this 

 particular form is endless and which is receiving the record, passes 

 from one reel to the other, as indicated by the arrows, it passes con- 

 secutively before each of the receiving magnets, which are shown in 

 horseshoe form, but which may also be single pole, and the subscrib- 

 ers, whose telephones are attached to these magnets, are thus con- 



