770,268. Telephone Exchange System. W. M. Davis. The inventor claims: A signal scheme for toll board connections, in which the calling subscriber controls his line signal on the main operating board and also controls a supervisory signal before the toll board operator. The called subscriber on a toll line controls a clearing out signal on the toll board, and when the toll operator, who supervises the connection, gets both signals she breaks the connection, thereby signaling the subscriber's operator for disconnection. The patent is assigned to the Stromberg-Carlson company.

770,269. Telephone Exchange System. W. M. Davis. The inventor claims: A common battery system intended to be "clickless."

770,296. Telephonic Relay. I. Kit

see.

The inventor claims: A telephone relay involving the principle of a pole changer, and comprising a pair of magnet poles with a polarized steel tongue between them, carbon or other resistance being interposed between the tongue and each magnet pole. The windings of the two magnets are in series, but in reversed relation, so that a current pulsation which makes one pole N. makes the other pole S, thus producing a double effect on the tongue, which oscillates between the poles, each single movement increasing the resistance on one side and correspondingly decreasing it on the other. The tongue is connected in parallel between two batteries and two primary windings whose opposite ends are connected to the two magnet poles, respectively. A common secondary winding is connected to line. Each movement of the tongue produces a fall of current in one primary and a rise in the other. The connection with relation to the secondary being opposite, these effects are cu

mulative, combining to send a supposedly doubled impulse to line.

770,377. Register and Alarm Mechanism for Telephone Toll Apparatus. G. A. Long. The inventor claims: A compact form of register and signal which may be applied to any telephone. The whole contrivance is contained in a little cylindrical box smaller than a watch case receiver, having ears by which it can be screwed on to a blackboard or the base of a desk set. The patent is assigned to the Gray Telephone Pay-Station Company of Hartford, Connecticut.

19 of the plunger will be forced down by arm 9 and will act slowly to return the same and cut off the generator. (See cut.)

770,556. Single Wire Selective Signaling and Intercommunicating Telephone. J. A. Brown. The inventor claims: A step-by-step party line selective system having all the stations in series on one wire. When in use, the telephone receiver and the secondary of the induction coil are in series with a condenser, so that no direct current can be sent over the line when already in use. Local batteries are used for both talking and signaling, in separate sets.

Switching

Mechanism.

771,114. for Intercommunicating Telephone Lines. A. K. Andriano and H. Herbstritt. The inventors claim: An intercommunicating system having the main cable carried around to all the stations as usual, and in addition to the ordinary ten-point switch, a real switchboard is provided having tilting rocker arms each carrying the terminals of the taps from a given group of the lines. The only trouble with this system is that it is burdened with too much apparatus. It is impossible to see where the direct line comes in the patent. The patent is assigned to the Direct Line General Telephone Company of San Francisco, California.

771,128. Hygienic Appliance for Mouthpieces. H. L. Cutter. The inventor claims: A bent sheet metal holder secured on a transmitter by screwing the mouthpiece into place

No. 771.128.

through a hole in the back plate, the holder carrying a little roll of paper at the top, which is fed down across the

A a hollow cylindrical cap is mounted, within which the contact springs are secured by bent over ends screwed up against a flange on the top. The hook lever is pivoted on the outside and has

a stud extending through a hole into the cylinder to work against one of the springs. (See cut.)

771,548. Telephone Call Register and Time Indicator. E. K. Hertford. The inventor claims: A combination for registering the number of calls and the time consumed by the operator in making connections "thereby enabling the management of a telephone exchange to figure the efficiency of an operator and ascertain the degree of perfection of the service." A time mechanism is started the instant a call is made, as indicated by the pilot and line lamps, and this is arrested when the call is answered. Each call is registered, and the person superintending the operators may observe the time from a distant point, "it being the purpose of this invention to have the mechanism connected electrically in series with the conductors for supplying electricity to the lights and to the receiver of the operator." One of these registers is supposed to be provided for each section of a switchboard.

771,853. Telephone Call Recorder. H. Abbott. The inventor claims: A call register to be placed at the subscriber's station and which gives a printed record showing the total number of calls for a particular period of time. A set of geared spindles for units, tens, hundreds and thousands are worked as usual through the units spindle by an electro-magnet which may be in the talking circuit of the subscriber. On the end of each spindle is an arrow, turning within a ring bearing numerals from zero to nine and reversed from normal. The arrow and numerals constitute type faces, and above this set is a fixed type unit bearing the number of the instrument. Mounted within the casing and across the type faces is a printing platen and between it and the type a card is inserted which is allowed to remain for a certain period, the time of insertion being noted. When the box is unlocked the key in turning forces the

platen and its card against the type and an imprint is thus obtained of the number of the station and the number of calls, the latter indicated by the arrow heads pointing to the numerals to which they have been turned, as in ordinary time stamps.

771,897. Call Signal Apparatus for Telephone Exchanges. W. W. Dean. The inventor claims: An automatic

ringing key, controlled, after setting, by the called subscriber. The patent is assigned to the Western Electric Company.

771,917. Wave Transmitter. R. L. Demoura. The inventor claims: A wireless telegraph transmitter embodying telephonic principles to a cer

tain extent.

771,946. Means for Supporting Telephone Receivers. F. W. St. John. The inventor claims: A receiver holder which maintains the instrument at the ear a fixed distance from the transmitter. A swinging arm carries a screw clamp at its outer end for the receiver and has its inner end mounted on a rock shaft coming out through the side of a casing set on the backboard over the transmitter arm. A finger on the rock shaft works a switch for the talking and signaling circuit.

771,920. Coin Collector. F. R. McBerty. The inventor claims: Coins under required size are immediately rejected and passed back to depositor through return-chute. If the coin is of the right size, the coin will be transferred to a temporary receiver where it is held until finally disposed of. In the meantime if another coin is deposited while the first is undisposed of such other coin will be immediately refunded through the return-chute. A deposited coin will also be refunded if the telephone line is already in use at some other station, assuming it to be a party-line. If circuit of line is broken, so that central office cannot be signaled, the coin may

cerned, and which may be used on a party line also. In the diagram m is the register magnet, o the register mechanism operated thereby through the pawl lever m2, I is the test relay, and w is the rebate or canceling lever whose handle lies outside the register box. When the subscriber calls, his hook lever h puts the test relay I on line wire 2. If busy, the test relay gets current and disconnects the relay m. Hence no call is charged. If not busy, the relay m gets current through 1-7-6-5-ground, from battery b. This pulls up the armature m' but does not fully register. It does drop a target p, showing the subscriber his call is in, and contacts q-q' and z-z' are closed so that magnet m is to line no matter how the lever is worked. When the operator plugs in, battery to line is reversed and bridged. If the connection wanted cannot be obtained the operator tells the subscriber to hang up and pull his lever. When he hangs up she pulls out the plug and he rebates the call, thereby resetting the target p. If the connection is obtained, the operator presses her key f after both subscribers have finally hung up, which puts generator G to both sides of line and causes magnet m to fully pull up, registering the call and restoring the target p. (See cut.)

A.

772,023. Automatic Telephone Exchange System and Apparatus. M. Bullard and L. A. Falk. The inventors claim: A common battery automatic exchange system constituting an improvement on that for which letters patent No. 709,740 were issued to Bullard and Rorty September 23, 1902. The earlier system also showed a party line arrangement with common batteries for talking, but had magneto generators at the substations for signaling. In the drawing four subscribers' stations are indicated, one S being on a private line L and the other three S3, S4, S5, being on a common party line. S is supposed to be calling and has selected station S3, and is about to ring. The contacts j-j3 should be shown touching the hook