US 886154 A
Description (OCR text may contain errors)
PATENTED APR. 28, 1908.
G. W. PIOKARD. OSCILLATION RECEIVER. APPLICATIQN FILED SEPT. 30. 1907.
UNITED sTATEs GREENLEAF WHITTIER PIGKARD, OF AMESBURY, MASSACHUSETTS.
Specification of Letters Patent.
'Patented April as, 1908.
, I Application filed September 30, 1907. Serial No. 895,151.
bury, State of Massachusetts,-have invented certain new and usel'ul Improvements in Oscillation-.Receivers, the principles of which are set forth in the following specification and accompanying drawings, wluch disclose the form of the invention which l now consider to be the best of the various forms in which the principles of the invention fmay be einbodied.
This invention relates to oscillation receivers, for use in receiving intelligence communicated by electroniagnetic. waves, and other similar uses.
The invention involves the extraordinarily high degree of useful action iu oscillation receivers, of a particular form of a certain electrical cond-,uctor which l have. discovered in the course ofmy investigations in this subject, which conductors, when embodied in an oscillation receiver inaccordance with the disclosure hereof, is effective to approximately double the degree ol' any previous oscillation receiver.' f
` 0f-the drawings, Figure 1 is a perspective view of a fragment of thc comluctor'of the invention; Fig. 2 is an elevation of an opera tivepair'of conductors, one of which, Z, is the conductor of Fig. l Fig. 3 is a section of means for operatively mounting the conductor Z of Fig. .3 Fig. '4 is'a sectional elevation of a practicalv mechanical holder for the conductors of Fig. 2, conductor Z being mounted as in Fig. 3; and Fig. 5 is a sectional eleva-t tion of another l'orm of holder l'or said coni mg it to an extremely high temperature, such.' as that ol' the electric arc, m order to render it electrically conducting and operative in accordance with this invention; and from the resulting fused mass, a fragment, as at Z, Fig. l, may be obtained, as above described. The fused mass Z is yellowish or waxen inapbrass member.
pearance, and constitutes an extremely sensitivemember` of an oscillation recelvel;
'.a-lthoi'igh the amorphousjpowdered form,
from which it is obtained, as by'fusion, is ap-v parently totally inoperative as a member of such a device.
face F is rough and not polished, being left inexactly the above described condition `resulting from breakage, as shown in Figi;` because l have found that the substance difl'ers from many other conductors in that a polished surface does-not offer as sen'sitive'al contact surface as a rough fracture face. .v The shbstance Z, onaccount of its'inherent prop-iv erties, however, constitutes a sensitive member ot' an oscillation receiver, irrespective ofY any rough character of its contact surface, provided that a suitablysrriall-aread thermo-j Junction is obtained, as by any suitable means.,
The conductor Z acts, ei'iclently with 'praw tically any other condiictor such as A, (Fig, 2), which may be brass for example, the rough fracture "face F of the member Z being arranged in contact with a face F of ,the
As shown in Fig. 3, the member Z may in a prac-tical form be placed in a liquefied mass -of fusible metal M contained in a metal cup C, the face F being ex osed from the fusible metal, which is allowe( to cool and harden so that the conductorZ becomes embedded in good electricallcontact therein.
. In Fig. 4 the mounting of Fig. 3 for the conductor Z is shown in posit-ion so -thatthe surfaces F and F offZ and A respectivel face each other. The face F of the suitab e conductor A may or may not be rough and may have any desired sha e or extent; An insulating base B has meta ic standards E, IGr secure-d to it by screws R, T; these standards being provided with binding posts Q for the leads to any suitable circuit `connections depemling on the -mode of use of the device, which may bc'connccted in any of the'circuits known to those skilled in the electrical arts, Ysuch as any wireless telegraphy or telephony or othercircuit for oscillating orl alternating currents. y
'l`hc member A is simply the end "0f a threaded. brass rod l; which is screwed into the standard-E.
'lhe cup (f -for the member Z is supported by a rod V -to which it may be non-rotatably' secured in any suitable manner; the 'rod having a tight rotating ht m the sleeve J,
which is rovided with a knurled rotatinghead ll. W 'ch turns the rod V and cup C by means of the pin V extending from rod V into a longitudinal slot Y in'the sleeve J. The sleeve J has annular lugs W which snugly fit the standard G and prevent longitudinal movement or play of said sleeve. `A helical spring S is located between the rod V -and' head H to which its ends may be soldered or otherwise suitably secured. The proportions may be such as to press the contact surface of member Z against member A with a pressure of about an ounce. although variations from this will do no harm unless the pressure be made so excessive as to destroy the small dimensions of the good contact vlwhich naturally exists, under such pressure,
between the'contact surfaces F and F ofthe respective members Z and A. A fiber cylinder K incloses the apparatus between the standards E,
In Fig.`5 is shown a holder in which the conductor Z may be manually moved directly, being mechanically held in circuit between the other conducting member L (which may be brass, and suitably secured to the oscillating rod E), and a conducting rod V secured to the standard G', the insulating base B' supporting the members D and G, which are secured to it by screws R and T. part E is pivoted in D at N, so that the mem er L can be swung to or from the rod V, and the spring S (having one end secured to art E) provides means for holding L agalnst Z, to hold Z in position between L and V- and in operating `contact with conducting member An adjustment for the spring S is provided, to permit variation of contact pressure between Z and L.
]ustment is mounted on the standard P, and y This adconsists of a ro'd K, to which the right-hand end of spring P is secured and on which .the
end of the springuma be wound or unwound, by turning the iur ed head Il which is secured to rod K. The standard P is slotted at Y as far as the erforation in it for the rod K and said rod 1s held in the perforation from rotation by the s ring tension, by means of the screw VV', ut 1s not so held against a convenient twist on the head H. This is a desirable form of holder, but many other suitable forms may be devised.
In operation, (Fig. 4), the desired circuit leads are connected to the binding posts O and Q, and by turning the head the surface F of member Z is rotated by very slight degrees with respect to the cooperating surface F of member A until the best action results, as indicated by the usual telephone in circuit. The operation in the case of Fig. 5
is substantially the same, with respect to the head ll and the binding posts O and Q.
The character of the surface F of member Z verting a large proportion of the energy of v vthe oscillations into a direct current suitable for operating the telephone.
Various other conductors, which may make thermo-junctions with member Z, may be used with said member, and the mechanical combinations of various modes of use may be unlimited.
A member of an oscillation receiver, which consists of a fused mass of oXid of zinc.
GREENLEAF WHllTlER lICKARD.
EDWARD H. RownLL, MYRA S. RownLL.