US1089091A - Receiving device for wireless systems. - Google Patents

Description

W. E. D. STOKES, JR. & G. W. DAVIS. RECEIVING DEVICE FOR WIRELESS SYSTEMS.

APPLICATION FILED DEC. 9, 1908.

Patented M51113, 1914.

M v a Novice 1:31 at 4 e1 ass fsysteins ct wli' c1 ing is e specification. e object o invention is to s new snd in red receiving device ior wireless telegraph or telephone systems.

those cys eniplefri what is known as the imperfect contest frequent adjustments here to he .con-

which often interrupts continuity with which the message can he end leeds to diiliculty in the service. To over come this objection, we provide i system by which 2; large number contacts are pro vided, any one of which instsntly he lbrought into circuit so. that if one contsct gives out or works imperfectly, another contact can he almost immediately utilized. lhe contact element which we preferably employ comprises 2, particular lrind of? iron pyrites, such as is found in nature in noncrystalline form and which has s, more or less carbonaceous shale enihedded therein. 'lo utilize these improvements, we preferably arrange one or more elements of this material on it stand and arrange e plurality of contacts with the various faces of each element so that dillerent portions of the some element can he used. "We also provide electric switching mechanism so that any one of the contacts can he quickly thrown into circuit. By this arrangement, the contacts may he adjusted to' various resistance and degrees of sensitiveness and any desired contact can he quickly thrown into circuit without having to lose time by making adjustment when receiving messages.

Une embodiment of the invention is represented in the accompanying dinning, re- 'lerring to which,

Figure l is e disgre-uimetic view illustinting" n wireless system with our invention applied thereto. Q is e plan view ol the contact arrangement on on enlarged scale, and 3 is e sectionnl View on the line 3-3 on a still larger scnle.

designe es en ll ch the ground or can th in e A goes th insiornier or J or which is circuit. in this cciving circuit we piece condenser or c c it} D which may he adjustable and iustnlile resistance or resists-no hotter may also he includ cnit. El telephone or other i receiving circuit coining circuit is preferably provided with switch I by which said circuit can he cut out when messages ere being or when the receiving eiiciiit s not to he riser. Bridging the receiving circuit in tassel manner is e responding circuit lll in which is pieced the imperfect contacts here insfter described. The circuit arrangements hereinbefore described are of an ordinary type and any other form or arrangement may he used.

The plurality 0t imperfect contacts is errange in the bridging circuit 10ll as follows: 0n e suitable base of insulating insteriei 12 is arranged at series of posts 18 eech having an upwardly projecting stem 14- which is screw-thrended- A piece of the element which is used which is preferably iron pyrites of e non-crystalline form having embedded therein more or less carbonaceous shale, has a hole bored therethrough and is fitted or placed on the stem 14-. This element is represented by I? in the drawing and iorrns the imperfect contact. The same is rigidly held on the stem M by e thumb nut 15 threaded on said stein. Each post 13 is connected by s wire 16 to a, common wire 1'? which is connected in the circuit 10-ll. Surrounding each stand 13 is a plurality of stands or uprights l8, tour being shown in the drawing as surrounding each stand 13. 'lhreeded'into each upright 18 is a, screw 19 which has a fine tip 20 which may be inside 0t platinum or any desired material to con tnct with the element P. Each of said screws 19 has an adjusting milled head 23. and it check nut 22 is also threaded on the some. By this arrangement, the contact or each point 20 with the element can he eccuretely end sensitivel adjusted and the adjustment one he fine by check nut 22.

Each of the stands or uprightslS is connected by a wire 23 to a button or post 24, which buttons or posts 24 are arranged in line near one side of the base 12, as illustratcd in Fig. 2.

Brackets 25 are secured to the piece 12 and between said brackets is arranged a metallic rod 26. Sliding on this rod 26 is abiock 27 which carries a spring arm 28 which can contact with any one of the posts or buttons 24. A screw 29 is threaded into the biock 2! so that the block can be locked in any position on the rod 26.

One of the brackets 25 is provided with a. binding post 30 to which the circuit i0ll is connected. By this arrangement, any one of the contacts can he brought into the circuit ELL-ll by sliding the block 2? along the rod 26 so that the spring arm 28 Wili contact with the proper button 2%. The contacts are adjusted at icisnre to obtain the desired resistanceand sensitiveness. Then when receivlng, if it found that any giarticniar Contact is not Working accurately or as sensitireiy as desired, by sliding the block 27 along the rod 26, any one of the contacts can he tried and the one which is the mostresponsive can be left in the circuit. can he done very quickly by the operator, as it requires no adjustment.

have found that is a peculiarity of erai contacts that the same have some spots thereon which are more sensitive than others and that there are nsnaiiy e plurality or" such snfaces around piece or mineral. By erra: ging a oinraiity of contents around a. singie eiernent, advantage can taken of this fact to get a number of contacts from one element.

We have found in practice that the iron pyrites of the character described makes a very sensitive and nice Working receiving or responding element.

ihe details and arrangements herein shown and described. may be greatly varied by a. skilled electrician without departing from the scope of our invention as expressed in the claims.

iherefore having thus fuliy described our invention, What we chairs and desire to secure by Letters-Patent is l. A receiver for Wireless systems having an element composed of iron pyrites having carbonaceous shale embedded'therein.

2. A receiving arrangement for Wireiess systems, comprising a base, a. pinreiity of responsive elements carried thereby, stands or uprights thereon supporting a piurality of adjustable contact-sengaging each element, 9. system of buttons or posts on said base connected with said contacts. a rod carried by said base, and e. sliding bloclr on said rod which can be moved to engage any one of said buttons or posts, whereby any contact can be thrown. into circuit;

hereunto testimony whereof we have two sub- Witnesses:

Minnie: L. Beers INA it. BAGWELL.

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