UNITED STATES PATENT OFFICE.
ROBERT H. MARRIOTT OF BROOKLYN NEW YORK ASSIGNOR TO UNITED WIRELESS
TELEGRAPH COMPANY A CORPORATION OF 'MAINE.
ELECTRICAL TUNING DEVIOE.
97$ 606. Specification of Letters-Patent. Patented Dec. t n 1910.
Application filed August 2 i 1909. Serial No. 514 441.
To all whom it may concern: a view of the frame carrying the movable
Be it known that I ROBERT H. Mailman coil shown in Fig. 2. Fig. 8. is another a citizen of the United States and a real- view of the parts shown in Fig. 7 with the dent of Brooklyn Kings county New York movable coil at right angles' to the fixed
5 have invented certain new and useful Iin- coil. Fig. 9. is a cross-section showing anproveinents in Electrical Tuning Devices other form of the invention in which two of which the following is a specification. coils are carried by the movable frame in-
My invention relates to tuning devices stead of one. Fig. 10. is a detail view of and more particularly to tuning devices em- the conductive guideway for the lower pivot
10 ploying a fixed and a movable coil for vary- pin of the movable frame shown in Figs. 7 ing the inductance. and 8. Fig. 11. is a diagram showing the
One of the objects of my invention is to connecting circuit of the coils illustrated in provide a. variable inductance for the high Fig. 9.
frequency transmission of electrical energy In accordance with the invention a fixed
15 forming part of tuning device in which coil 1. and a. movable coil 2. are connected in inductance a fixed coil and a movable coil the receiving circuit of the high frequency are used the said coils being capable of be- system for the transmission of electrical ening placed in inductive relation and being ergy the particular form of the system conductively connected and the movable illustrated being one provided with an aerial
20 coil being provided with means for present 3. to which the coils are connected. The ing one side and then the other to the fixed coils are connected with ground by means coil whereby a variation in the'inductance of a wire 4. and switch 5. having arms 6 for tuning is produced. and 7 connected by cross-bar 8. the ground
Another object of my invention is to pro- . wire 9 passing through the condenser 10 of
25 vide the 'apparatus and system 'described variable capacity.
with a switching means whereby said fixed The movable coil 2. is carried on a frame
and movable coils may be thrown in paral- 11. and always remains at one side of the
lel or in series as desired. face of the fixed coil 1. Means are provided
Another object of my invention is to pro- for bodily moving the coil and frame so as
30 vide a simple form . of mechanism for to alternately present first one side of the actuating the -frame carrying. the movable coil and then the other to the fixed coil 1. coil. These means may be varied. In the particu-
With the. above and other objects in view lar embodiment of the invention illustrated my invention consists in the parts improve- the frame 11. has a crank 12 attached there-
35 ments and combinations more fully pointec to. The lower end of the crank enters into out hereinafter. the base '+  8 the lower' end turning in the
Referring now to the drawings which are base. The upper end 14 of the c e l is pro-attached to the specification and form a part aided with handle 15 so as to c inu am thereof Iupure 1. is a diagrammatic ilium ing of the frame. Suitable mean ate pro-
40 'tration of the system showing the circuits.
Fig. 2. is a diagrammatic view of the aerial
receiving circuit containing a fixed coil and.
in parallel. and the current flowing so as tit^ diminish the self-induction. Fig. 4. shows a parallel connection of the coils with the current flowing so as to increase the self-
50 induction of the system. Fig. 5. shows series arrangement of the coils the current flowing so as to' tend to diminish the self. induction and Fig. 6. shows a series an. rimgemen ; of coils the current flowing se
55 as to increase the self-induction. Fig. 7. ?
Suitable means arepoovid.4e
v:ded for guiding one enel of he frame 11 as it is revol red by the crank L pair of pivot pins 17 are provided fo t s piir-
a bodily movable reversible movable coil. pose. These pins are coc^ared to the
tame
pins
Fig. 3. illustrates one mode of connection of and move in suitable guide-ways at the top 45 the fixed and movable coils the coils beam a bottom. of the s;: 3por=i=ng ndard.
s guide-wa7s for the ot pine pref-
ly r' le .:f spring A. a. eel in
10. The strip 13 a n-
:e 19 formed between _ I ti as -arm.
aided with a reentrant unrtiox' as to 'aside the min and insure rev eit of the ame 11.
Grow- Ilse fixed '?d r ioe l
l cal el or v se Yes .!i w  .:. seuse this
60 65 70 '75 80 85
95 1'0J

further. In other words the self-induction may be made to vary from the amount produced by the arrangement of Fig. 3. to that produced by the arrangement in Fig. 6 gradually and by aid of a simple apparatus. 70 By this means the wave length to which the circuit is tuned may be correspondingly varied.
Turning now to the apparatus shown in Fig. 9 this differs from the other figures in 75 that two coils are carried on the movable frame instead of one. One of these coils and then the other is presented to the fixed coil. The coils on the moving frame are always connected in parallel relation as indicated 80 in Fig. 9.
Referring to Fig. 11 the connections of the apparatus shown in Fig. 9 will be apparent. Two apparatuses like those in Fig.
9 are used. One of them is placed in the 85 aerial circuit and the other in the local detector circuit. The two coils 46 47 on the movable frame have their centers connected as at 48 by a wire from which a wire 49 leads to a binding post 50 which is con- 90 nected with the detector circuit. A branch wire 51 leads from the wire 49 to a switch-arm 52. The two outer ends of the coils 46 and 47 are connected at 53 from which
a wire 54 leads to the outside of the fixed 95 coil 55. The inside of the coil 55 is connected by means of a wire 56 to contact points 57 and 58 of the switch. The out-sides of the coils 46 and 47 are also connected by a wire 59 to a switch point 60. 100 The switch point 61 is dead. From switch arm 62 a wire 63 leads to a binding post 64 which is connected with the detector circuit. By the above set of switches and connection
the fixed and movable coils may be thrown 105 in series or in parallel relation with each other. A condenser 65 of variable capacity may be connected between 50 and 64 in a well known manner. To the terminals 50 and 64 may be connected a detector circuit 110 including a detector 66 a condenser of fixed capacity 67 a potentiometer 68 (the latter supplied with current from a battery 69) and telephone receiver 70. The antenna circuit includes the antenna 71. which is con- 115 nected to binding post 72 which is connected by wire 73 to inside of fixed coil 74 and by wire 75 to switch arm 76. The outside of coil 74 is connected by .wire 77 to the out-sides of the coils 78 and 79. A branch wire 120 80 leads from the wire 77 to switch point
of the said coils. By throwing the switch 81. The insides of coils 78 and 79 are con-and placing the coils in series with the cur- 1 nected from which connection wire 82 leads rent in opposition the arrangement shown I to switch points 83 and 84. Switch arm 85
in Fig. .5 is secured with an increase of connects by means of wire 86 to one side 125
range in the change of self-induction over of a ;variable condenser 87 the other side of
that of Figs. 3 and 4. By rotating the mov- which is connected to ground by wire 88.
able coil still preserving the series arrange- Switch point 89 is dead. The fixed and
ment the current will flow as shown in Fig. movable coils of the antenna circuit may
65 6 thereby increasing the self-induction. still . thus be thrown in series or in parallel. It 130
purpose. When the conducting switch-arms 6 7 are on the contact points 21 and 22 as illustrated in Fig.. 1. the wires 23 and 4 .will connect the two coils 1 and 2 in parallel. 1
5 When the switch 5 has its arms 6 and 7 in contact with the switch-contacts 25 and 26 (the contact 25 being a dead :ontact) the two coils 1 and 2 are thrown ia series velation.. It will be observed that 1 and 2 are
10 in inductive relation with each other during the rotation of f-the coil 2.
The local receiving circuit . illustrated in Fig. 1. is likewise provided with a fixed coil 27 and a movable coil 28 which coils are in
15 inductive relation. The fixed coil 27 is parallel to and opposite to the face of the fixed coil 1. The two fixed coils 1 and 27 are al-ways in inductive relation and may be separated more or less or brought close together
20 to vary this relation. By mounting the movable coils on frames and in such a manner that they always remain at one side of the face of the respective fixed coil the movable coils do not project beyond the face which
25 permits the fixed coils to be brought close together. The fixed coil 27 and the movable coil 2S may be thrown in parallel or in series with eachv other by means of the switch 29 and the arms 30 and 31. These arms co-
30 operate with contact buttons 32; 33 34 and 35 the buttons 32 33 and 35 being connected with the circuit as indicated. The pivot points 36 and 37 of the switch are connected by wires 38 and 39 to opposite sides of the
35 detector 40. A condenser 41 of variable capacity may be connected in the detector circuit and the telephone 410 a potentiometer 42 with battery 43 are connected with the circuit at 44 and 45 as.usual and a condenser
40 400 is inserted between the points 44 and 45 to prevent the battery from running down.
In accordance with my invention a manipulation of the switches 5 and 29 and a rotation of the movable coils 2 and 28 results
45 in the arrangement of circuits and flow of current illustrated in Figs. 3 4 5 and 6. With the faces of the fixed and movable coils in juxtaposition and with a parallel connection of the coils the windings being con-
50 nected as shown in Fig. 3 the self-induction of the coils is reduced to the lowest amount. By rotating the movable coil and presenting the other side thereof to the fixed coil with-out changing the connection i. e: without
55 moving a switch the current flows as shown in Fig. 4 which increases the self-induction.
 . 8
will be observed that the movable coils 46 and 47 are wound in the same direction and the movable coils 78 and 79 are wound in the same direction. Moreover the inductive
5 effect of the movable coils on their corresponding fixed coil is either additive or sub-tractive in accordance with the movement of 'the frame carrying the movable coils. By separating the fixed coils the inductive
10 action of the antenna circuit on the detector circuit may be. varied.
Having thus described an embodiment of my invention it will be obvious that many changes may be made in its form without de-
15 parting from the principle thereof.
Claims :
1. A tuning device for the high frequency transmission of electrical energy comprisin a fixed• coil a movable coil said fixed an
20 movable coils being in inductive relation and means for bodily moving the movable coil so as to alternately present one side and then the other to the fixed coil said movable coil being arranged at all times at one side
25 of the face of the fixed coil.
2. A tuning device for the high frequency transmission of electrical energy comprising a fixed coil a frame a movable coil secured to one side of said frame said fixed and
30 movable coils being in inductive relation and means for bodily moving the frame so as to alternately present one side of the coil and then the other to the fixed coil said movable coil being arranged at all times at one
35 side of the face of the fixed coil.
3. A"tuning device for the high frequency transmission of electrical energy comprising a fixed coil a movable coil said fixed and movable coils being in inductive relation a
40 switch for throwing said fixed and movable coils in parallel and means for bodily moving the movable coil so as to alternately present one side and then the other to the fixed coil said movable coil being arranged
45 at all times at one side of the face of the fixed coil.
4. A tithing device for the high frequency transmission of electrical energy comprising a fixed coil a movable coil said fixed and
50 movable coils being in inductive relation switching means for throwing said fixed and movable coils. in parallel and in series with each other and means for bodily moving the movable coil so as to alternately present one
55 side and then the other to the fixed coil.
5. A tuning device for the high frequency transmission of electrical energy comprising a fixed coil a movable coil said fixed and movable coils being in inductive rela-
60 tion said movable coil being arranged at all times at one side of the face of the fixed coil a frame to which said movable coil is secured and a crank attached to said frame whereby said frame maybe moved to alter
nately present one side of the movable coil 65 and then the other to the fixed coil.
6. A tuning device for the high frequency transmission of electrical energy comprising a fixed coil a movable coil said fixed and movable coils being in inductive rela- 70 tion said movable coil being arranged at all times at one side of the face of the fixed coil a frame on which the movable coil is secured a crank attached to said frame and guiding means for said frame the parts 75 being so constructed and arranged that one side and then the other of the movable coil may be presented to the fixed coil.
7. A tuning device for the high frequency transmission of electrical energy comprising a fixed coil a movable coil said fixed and movable coils being in inductive relation said movable coil being arranged at all times at one side of the face of the fixed coil 'a frame on which the movable coil is secured a crank attached to said frame a pivot for said frame . and a conducting guideway for said pivot the parts being so constructed and arranged that one side and then the other of the movable coil may be presented to the fixed coil.
8. A tuning device for the high frequency transmission of electrical energy comprising a pair of fixed coils said fixed coils having their faces in inductive relation and opposite 95 to each other a pair of movable: coils one for each fixed coil each movable coil being in inductive relation with the corresponding fixed coil each movable coil being at all times arranged at one side of the face of the 100 corresponding fixed coil and means for bodily moving each movable coil to alternately present one side and then the other to the corresponding fixed coil.
9. A tuning device for the transmission of electrical energy of high frequency comprising a pair of fixed coils each consisting of a fiat spiral mounted on a frame said fixed coils having their faces in inductive relation and opposite to each other and capable of being moved toward and from each other to vary the inductive action a pair of movable coils each consisting of a flat spiral each movable coil being in inductive relation with the corresponding fixed coil and each movable coil being at all times arranged at one side of the face of the corresponding fixed coil and means for moving each of said movable coils toward and from the corresponding fixed coil.
In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.
ROBERT H. MARRIOTT. Witnesses :
W. C. MARGESON W. F. BISSING.
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