US936490A - Telegraphone. - Google Patents

Description

H.' R. STUART.

TELBGRAPHONE. APPLICATION FILED MAR. 21

Patliied Oct. 12, 1909.

- UNITED i sTATEs PATENT. orrrcn. HAnvE n. STUART, or WHELINGwEsTvIRGINI, AssIGNoB, To AMEiucAN TELEG- mPHoNn COMPANY, A CORPORATION or THE DISTRICT or coLUrrBIA.'

TELEGRPHONE.

936,490. Specification of Letters Patent.

t Application led March 21', 1908. Serial No. 422,399.

To all whom 'it may concern:

I Se it known that I, HARVE R.- STUART, a c1t1zen of the United States, residing at Wheeling, in the county of Ohio and State of West Virginia., have invented certain new and useful Improvements in Telegraphones, of which the following is a full, clear, .and

' exact description.

' This invention relates to telegraphones ofl that class in which the recording steel body 1s in the form of a disk. In this kind of machlne, it is well known that if the disk runs at a uniform speed, the record will be weaker as 1t approaches the center of the disk, on account of the peripheral speed with respect to the magnet growing less as the diameter decreases. Speed governors are not always desirable, and sometimes cannot be relied upon for accu-rate graduatioirof speed as the magnet shifts its position.' lonsequently, two magnets, one moving from the periphery toward the center and theother from the center toward the periphery, and both conupon one face of the disk, while the other" Ahas been arranged to act upon the opposite.

' face,'both magnets being fed radially the entire distance from the periphery to the hub. Under some conditions, however., ,it is A not convenient or feasibleto operate a magnet on each side of the disk.

My invention therefore consists, broadly,

in locating the two magnets both on the same side of the disk, leaving the other side free. In this arrangement, each magnet can act upon only one-half of the recording surface, so that the capacity is reduced in that proportion, butfor some purposes this is not material, and when the reducedA capacity is not material, the advantage of a clear space on the opposite side of the disk isgained.

My invention is illustrated 1n the accompanying drawing, in which F1 ure 1 is a side elevatlon of a conventiona form'of my invention inwhich the two magnets are located onV opposite sides of the center of the disk. Fig. 2 is a similar view of a form of the invention in whichtwo magnets lare mounted on a` single frame which is fed by a single screw. Fig. 3 is a similar view inwhich the two magnets are located on opposite sides of the center of the disk, but travel the entire distance across the recording surface, the spiral path traced by one alternating with that traced by the other; and Fig. 4 illustrates the path of the two magnets when arranged as in Fig. 4.

Referring to the drawings, 1 indicates the recording body in the form of a disk, it being mounted upon a central rota ting shaft 2. Arranged parallel to one face of the disk Patented oct.- 12,o 1909.

is a feed screw 2 to be rotated in any suitable j the hub, while the thread at the other endof the screw is opposite the inner half of the recording surface which lies between the suitable carriers which are provided with a. nut or threaded portion 8 and engage the respective threaded portions 4 and 5` of the feed screw. ,The magnets are so placed upon their respective threads that when one'of .them is at the extreme outer position, the

other isat the extreme inner position of the respectlve recording surfaces. When i the machlne is 1n mot1on, the magnets uniformly 'shift their relative positions, both of them traveling in the same direction, as indicated by the arrows.V The'record produced and reproduced by the magnet 6 will always be stronger than that produced and reproducedby the magnet 7 because it acts upon a portion of the disk which is moving at a higher speed than that portion ofthe disk which is acted upon by the magnet 7. But,

4ao point a, and the hub. Therecording magnets indicated by 6 and 7 are mounted upon atI all times, since the magnets are connected in the same circuit, the record produced and reproduced by the magnet 6 will be augmented by that produced and reproduced by the magnet 7. Since the magnets change their radial positions uniformly, one grow-v ing weaker while the other'- grows stronger,

the sum of the record produced and repro- I' In the arrangement shown in Fig. 2, the

capacity of the` disk remains the same as in the arrangement of Fig. 1, and the strength of the record produced and repro- A` duced is also'the same, but the two magnets the recording surface.'

are here mounted upon a single frame 9 which requires a single nut 8 and a single feed screw.

Inl Fig. 3, the two magnets aie locatedv upon opposite sides of the center of the disk, but each travels the full radial width of In order to prevent one of these magnets from tracing the saine spiral path on the disk which is traced by the other, and thereby causing interference of the two magnetic records, the'pitch of the threads on-the feeding screw are made coarser, or the pitch and width of the record path made less, and one inagnet'is so placed upon the screw that it will trace a spiral line, the turns of which will alternate with those of the spiral line traced by the other magnet, as clearly illustrated in Fig. 4, wherein the full line indicates the path of one magnet, and the dotted line the path of the other. llith this arrangement, the capacity ofthe disk is the same as in the other4 structures and the production and reproduction of the recordre-mainsthe same.

What I claim, is:

l. In a telegraphone, the combination of a recording body in the'form of a disk, two telegraphone magnets located upon the same side of the disk, and means for moving one of the magnets from a point on the disk running at high speed to a point at lower speed and for moving the other magnet simultaneously and uniformly therewith from a point on the disk running at low speed to one runningat a higher speed, substantially as described.

2. In a telegraphone, the combination of a recording body in the form of a disk, two

telegraphone magnets located on the saine side ofthe disk, said magnets being located upon opposite sides of the center of the disk and feeding mechanism for moving .said mafrnets simultaneously in a substantially radial direction, one magnet from a position on the vdisk of hiUh speed toward a position of low speed, anda the other from a posit-ion on the disk of low speed to 'one of higher y speed.

In witness whereof, I subscribe my signature, in the presence of two witnesses.

- HARVE R. STUART.

lvitnesses FRANK S. OUii,

WALDo M. CHAPIN.

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