US764094A

US764094A - Wireless telegraphy.

Info

Publication number: US764094A
Application number: US21188504A
Authority: US
Inventors: Leonard D Wildman
Original assignee: Individual
Current assignee: Individual
Priority date: 1904-06-10
Filing date: 1904-06-10
Publication date: 1904-07-05
Anticipated expiration: 1921-07-05

Description

No. 764,094. PATENTED JULY 5, 1904. L D. WILDMAN.

WIRELESS TELBGRAPHY.

APPLICATION FILED JUNE 10 1904.

N0 MODEL.

.w v .r

l l T UNTTED STATES Patented July 5, 1904.

PATENT rrrcie.

WIRELESS TELEGRAPHY.

SPECIFICATION forming part of Letters Patent No. 764,094, dated July 5, 1904.

' Application filed June 10, 1904:- Serial No. 211,885. (No model.)

To all whom it may concern:

Be it known that I, LEONARD D. I/VILDMAN, a captain in the Signal Corps, United States Army, have invented certain new and useful Improvements in WVireless Telegraphy, of which the following is a specification, and which, if patented, may be used by the Government of the United States or any of its officers or employees in prosecution of the work for the Government, or by any other person in the United States, without the payment to him of any royalty thereon, in accordance with the Act of March 3, 1883, Chapter 143, United States Statutes, XXII, page 625.

My invention relates to wireless-telegraph systems which utilize in their operation electromagnetic or Hertzian waves; and it relates more particularly to a protective device for the armatures of alternating-current generators commonly employed as the prime source of electrical energy at the sending-stations of such systems.

It is of frequent occurrence in transmitting wireless-telegraph messages that the reaction of the oscillating circuit on the primary circuit containing the alternating-current generator and the signaling-key or the high potentials suddenly developed in said primary circuit by opening and closing said key breaks down the insulation of the armature-windings, and thereby short-circuits the same.

It is the object of my invention to provide means for preventing such breaking down of the insulation of the armature-windings and the resulting short circuit thereof.

My invention may best be understood by having reference to the drawing, which accompanies and forms a part of this specification and which illustrates diagrammatically one embodiment of my invention. In this drawing the figure represents a wireless-telegraph transmitting system of a well-known form to which my armature protective device has been applied.

A is an alternating-current generator connected in circuit with a signaling-key k and the primary winding P of a transformer T. The secondary winding S of said transformer is connected to the terminals of a spark-gap S, and a condenser C is connected across the terminals of said gap. From the points a and a in the circuit of the generator A and the primary P are connected the leads a, .s' e and a s e to earth, each lead being provided with an adjustable spark-gap s and s.

The operation of the system is as follows: The spark-gaps s s are adjusted to withstand the maximum safe potential to which the armature-winding of the generator A may be subjected. If for any reason the potential in the primary circuit should rise above the aforesaid safe value that the insulation of the armature-winding is designed to standas, for instance, when the key it is opened or closed the increased potential will cause sparks to pass between the gaps s a, or either of them, to earth instead of passing through the armature-winding. and destroying the insulation thereof.

It is not necessary to employ two gaps s s, as it is obvious that one only may serve the purpose of protecting the armature-windings from excessive potential discharges, such as a non-arcing lightning-arrester.

It will be obvious to those skilled in the art that other means may be substituted for the gaps s s for accomplishing the object of this invention without departing from the spirit of my invention, and therefore I do not desire to be limited to the particular construction herein shown and described; but

WVhat I claim as new, and desire to secure by Letters Patent, is

1. In a wireless-telegraph system employing A an alternating-current generator as a source of energy, means for protecting the armature of said generator from excessive potential discharges, said means consisting of means for conveying such discharges to earth, substantially as described.

2. In a wireless-telegraph system, an alternating-current generator connected to the primary winding of a transformer, oscillationproclucing means in the secondary winding of said transformer and a conductor provided with a spark-gap connected from one terminal of said generator to earth, substantially asdescribed.

3. In a wireless-telegraph system, an alternating-current generator connected to the prinating-cnrrent generator connected to the primary winding of a transformer, oscillationproducing means in the secondary winding of said transformer and connections from each terminal of said generator to earth, each of said connections being provided with an adjustable spark-gap, substantially as described.

, In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

LEONARD D. \VILDMAN.

Witnesses:

(Dims. A. CLEMnN'rs, WVM. H. DE LAoY.