US1035257A - Instrument for teaching telegraphic codes. - Google Patents

Description

T. M. ST; JOHN.

INSTRUMENT FOR TEACHING TELBGRAPHIG CODES.

APPLICATION FILED AUG.8, 101p.

1,035,257, Patented Aug. 13, 1912.

Wihweboeo: M ZM %MM J M QWM- nected with switch lever 7.

THOMAS M. ST. JOHN, 013 NEW YORK, N. Y.

INb'IBUMEl TT FOR TEACHING TELEGRAPHIC CODES.

Specification of Letters Patent.

Patented Aug. 13, 1912.

Application filed August 8, 1910. Serial No 576,071.

To all whom it may concern:

Be it known that I, THOMAS M. ST. JOHN, a citizen of the United States of America, residing in the borough of Manhattan, city, county, and State of New York, have ,invented a certain Improved Instrument for Teaching Telegraphic Codes, of which the following is a specification.

In the accompanying drawing: Figure l is a diagram showing the pieces of apparatus and appropriate circuit connections; Fig. 2, a plan view of the code plate; and Fig. 3 shows a modification. V

1 is an electromagnet of which 2 is the armature lever and 3 the armature lever stop. This may be deemed to be an ordinary sounder. It is shown, however, so that it may be used also as a buzzer. On the armature lever is the ordinary buzzer contact spring 4. One pole of the battery B is connected through the windings of the magnet and by wire 5J0 one of the contact points 6 of a two-point switch 7. Wire 5 is connected to the fixed contact stop 3 cooperating with the spring 4 and switch contact 8 is connected to the armature lever. The opposite pole of the battery is connected to a plate 9 herein called the code plate and also to the lever 10 of a normally open Morse key. The bottom contact l l of the key is connected to switch 7 which latter is also connected by a flexible wire to a pointer 12. Preferably, the handle of the pointer is "of insulating material and may be of wood. It is only necessary that the point 12' should be con- When the switch is in the position shown in the drawing, the key 10 may be operated according to the Morse or other code and solid dots and dashes will be sounded by magnet 1. If the'switch, however, be transferred to the point 8, the magnet acts as a buzzer and the dots and dashes have the characteristic sound of wireless telegraph signals. The code plate 9 may, as in Fig. 2, e of metal having a facing or coating of'enamel or .other insulating -material through which are openings exposing the surface of the plate. The widths of the exposed surfaces correspond with dot and dash signals. For instance, the letter 9 is shown as formed by two, narrow exposed surfaces of the metal plate representing two dots, then by a Copies of this patent may be obtained for five cents each, by addressing the wider exposed surtace representing a dash and finally by 'a narrow exposed surface representing a dot. In this way, the entire alphabet of any e'odcinay be represented. The constituent parts of each signal may be disposed vertically as shown in the draw-- ing or they might be horizont .ly disposed; and, if the plate shown is turned upon its side, they will be horizontally disposed. Now, if the learner draws the contact point 12 across the exposed plate surfaces representing dots and dashes for the formation of any code character, the dots and dashes would be audibly reproduced by the magnet either as solid (lots anddashes or buzzer (lots and dashes-according to the position of switch 7.

lVith a little practice, one may quickly learn any dot and dash code. Of course, the code plate may be prepared in any other way to effect the result desired;'and, instead of the dots and dashes being formed by dot and dash impulses transmitted through the exposed metal surfaces of the plate, they may be formed by interruptions' of a closed circuit in which case the dot and dash characters on the plate would appear as areas of insulating material, as

indicated in Fig 3, which shows a section of the plate with the characters 9, 'w, r placed thereon inthe manner last described.

I claim: Telegraphic code teaching apparatus comprising a metal plate with a plane upper surface having insulating enamel dis-.1

posed thereon so as to form dot and dash patterns or characters thereon combined with a conducting stylus, a source of electrical energy and a sounder, a circuit including the aforesaid parts, buzzer contacts associated with the sounder, a circuit connection including the buzzer contacts and a switch whereby when the switch i s in one position the, dot and dash signalsare produced by the buzzer action of the sounder and when in another position by the plain action of the sounder.

In testimony whereof, I have hereunto subscribed my name.

THOMAS M. ST. JOHN.

Witnesses:

LENA C. SrnAKnR, BLANCHE M. RUSK.

Commissioner of Patents,

Washington, D. C.

Images