US873084A - Telegraphone. - Google Patents

Description

PATENTED DBO.. 10, 1907.

V. POULSEN. -TELBGRAPHONEl APPLICATION FILED SBPT.29. 1902. BENEWED'MAY 2, 1907.

2 SHEETS-SHEET 1.

gom/1to0@ 7m Soznm y @WLM/w :maa M4 PATENTED DEG.`10, 1907.

V. POULSBN. l v

TELBGRAPHONE.

` The surface of the sheet may be perfectly UNITED sTATEs' PATENT oEErcE.

.VALDEMAR POULSEN, OF COPENHAGEN, DENMARK, ASSIGNOR TO AMERICANTELEG- RAPHONE COMPAN Y, A CORPORATION OF THE DISTRICT OF COLUMBIA.

TELEGRAPHONE.

Specification of- Letters Patent.

Patented nee. 1o, 1907.

Application tiled September 29. 1902, Serial Np. 125.148. Renewed Hay 2, 1907. Serial No. 371.455.

To all 'whom tt may concern.'

Be it known that I, VALDEMAR PoULsEN, a subject of the King of Denmark, residing at Copenhagen, Denmark, 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, the object being to provide a form ofinstrument which is capable of recording a comparatively long message or speech in or on a comparatively small, compact and easily handled recording bod i It is also an object of the invention to produce a recording device which will render it possible to run the machine at a slower` speed than has been heretofore possible without diminishing the intensity of the record or the distinctness with which it is reproduced.

Another object of the inventlon is to provide a recording body of such form that it can be easily transferred, sent by mail or other carrier, easily adjusted to, and removed from, the telegraphone, and generally handled, without injury.

A still further object is to provide means for more rapidly eiiacing a record' from the recording body than is possible by methods heretofore practiced.

All forms of the telegraphone heretofore produced have embodied a recording body in the form of a narrow elongated strip, such as a wire or ribbon of steel, or other para-mag- 4 netic material. The'material in this form requires either spools upon which it is -wound and unwound to pass before the recording magnet, or a rotating cylinder upon which the wire is permanently filed. A machine in either of these forms is necessarily large for a given capacity. Experiments have now demonstrated the fact that it is possible to record the electrical undulations created in the telephone circuit in a body of magnetic material inthe form of a sheet, and to make such record in closely adjacent, parallel lines.

smooth, in which case the magnet would be guided thereover by suitable mechanical devices, or it may be provided with grooves or corrugations with which the poles of the. magnet mechanically engage to properly guide the magnet over the surface. The sheet may obviously be used in various forms, each of which will require its own particular construction of instrument erly direct the magnet over its surface. For instance, the sheet may be in the form of a cylinder or cone, either with or Without a joint; it may be a fiat sheet like a postal card, or it may be a disk. In the case of the cylinder or cone the magnetic record would be traced upon its surface in a screw-line, and in the case of a fiat sheet the record would be traced in straight lines, while in the case of a disk the tracing would be in the form of a spiral, leading from the edge towards the center. The recording body must be made of steel, nickel or some other magnetizable material. As a material for said forms of recording body can be used the different kinds of steel, described in the magnetic literature as well as any material which possesses high remanence, permanence, permeability or other property suitable for telegraphonic purposes. (For instance molybdaen-steel etc.) The accompanying drawing is illustrative of the invention and consists ofthe following figures: Y

Figure 1 is a view of a somewhat conventional form of telegraphone; Fig. 2 is a similar view of a different form of machine; Fig. 3 shows two sectional views of the improved magnets, single and double pole; Figs. 4, 5, 6 and 7 are views of different forms of the recording body, and Fig. 8 illustrates the im roved eiacing device. i

n Fig. l, a and b are standards supporting a shaft c, upon which is mounted a carrier d for the recording body e of the telegraphone. The carrier is a cone, and the recording body,

which is a cylinder, is put on it, as shown 1n f the drawing. The shaft with the carrier is adapted to be rotated from a suitable source of power through the medium of a pulley f.

The recording and reproducing magnet is indicated at s and is adapted to be moved lengthwise of the cylinder, as a piece of a nut h2, with which it 1s in a solidcollection, is moved on by a screw-thread on the shaft c. The carrier d may also be adapted to wear the recording body shown in Fig. 4. This is a very thin sheet of steel, nickel, or other para-magnetic material, rolled into cylindrical form in such a way, that the joint is a sorewline. The carrier must then be a cylinder and providedwith something to keep fast the recording body. The cylinder, however, may be made without an,open

to prop--55 joint., in which case. it may also be of very thin material or of heavier nmterial, as shown in Fig. l 'lhisla-st figure, however, more particularly illustrates a record carrier in cvhndrhral form havlng upon its surface, grodves r which are traversed by the poles of the `recording magnet in order to properly guide and feed it.

Special meclninism for recording upon a llat sheet. such' as shown in Fig. 5 is not illustra-led, as it is not considered necessary since it can be understood that the recording magnet can even be moved back and forth by hand across lhe face of such a sheet, but an arrangement of guide rails and racks can easily be applied for this purpose.

Mechanism for using the form oll recording body shown in Fig. 6 is illustrated in Fig. 2. This, however, is conventional. 'lhe disk is indicated by 1* and is mounted upon a vertical axis g, rotated from a source of power through the pulley g. On the axis g is a )inion (12, engaging a large spur-gear 7L. Yheel l1I drives the screw-shaft 'i through the reducing bevel-gear 11.. Shaft carries the magnet s and is arranged in a radial position. As the disk vr2 is rotated on its axis g, the magnet is very slowly moved towards the center and therefore traverses a spiral path.

When the recording body has a perfectly smooth surface, it may be necessary to adjustably mount the magnet, so that it may be slightly moved to accurately locate its poles for reproducing a record which has )een previously made, because parallel magnetic lines of the record are very close together and a slight displacement of the poles of the magnet in reproducing would result in indistinct reproduction or double speech. By means of a line screw the oles of the magnet can be adjusted latera ly to bring them accurately into the magnetized line. This is in Fig. 1 done by means of a screw n. This screw has a cone, which Will press the arm p against the feather g. In this Way the distance between the nut h and the recording and reproducing magnet may be varied.

Fig. 3 illustrates the improved form of re cording and reproducing electro-magnet, the essential feature of which is that the end of the pole which is presented to the recordingsurface is pointed, or terminates in a'surface of very small area compared with the diam- The result of this iseither a permanent. magnet or an electromagnet is used, but the present improvement consists in the use of a magnet having a pole pieee sulliciently broad to cover a number of the magnetic record lines, so that the obliteration can be quickly accomplished. The pole of the magnet may, in fact, beI broad enough to cover the entire length of the cylinder or sheet, in which case a single rotation of the cylinder or a single movement of the sheet past the pole would be sullieient to remove thc entire record. ln Fig. 1 is obliterated With along horse-shoe magnet indicated by o. Often is also used one or more single magnets placed one after another in the revolving direction. Fig. 8 shows thel pole of permanent magnet M applied to the 'surface of a cylinder andI spanning a plurality of the magnetic lines graphically represented at m.

llaving described my invention7 l claim:

1. A record receiving body for telegraphones consisting vof magnetic material in sheet form, in combination.with ymeans `for tracing magnetic lilies throughout its` surface.

3. A record receiving body for telegraphones consisting of a sheet of magnetic material having a smooth surface, in combination with means for tracing lines of magnetism throughout its surface.

3. A record receiving body for telegraphones consisting of a sheet of magnetic material inthe form of a cylinder, in combination with means for tracing lines of magnetism throughout its surface.

4. A record receiving body for telegraphones consisting of a sheet of magnetic material in the form of a cylinder and having a smooth surface, in combination with means for tracing a screw-thread line of magnetism thereon.

5.. A record receiving body for telegra- 6. A phonogram consisting of a sheet ofparamagnetic material containing a magnetic record of speech or sounds arranged thereon in lines covering its surface.

7. A phonogram consisting of a cylindrical surface of paramagnetic material' having traced thereon by electro-magnetism, a magnetic record of speech or sounds extending throughout its surface.

8. A record receiving body for telegraphones, having a smooth .magnetic homogeneous surface and means for tracing contigu'4 ous magnetic lines upon said surface.

In witness whereof, I subscribe my s1gna ture, 1n presence of tWo witnesses.

VALDEMAR POULSEN.

Witnesses:

- CARL SCHAU,

J. HERM. CHRISTENSEN.

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