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Патент USA US2406046

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Aug. 20, 1946.
B. syswlzzzY
1-2;406;1046
TELEGRAPH ,SIGNAL ENCIPHERING KEY TAPE PRODUCING DEVICE
'
Fil'ed May 21, 1942
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INVENTOR
B. 5. SWEZEY
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ATTORNEY
2,406,046
Patented Aug. 20, 1946
UNITED STATES ‘PATENT OFFICE
; 2,406,046
TELEGRAPH ‘SIGNAL ENCIPHERING KEY
TAPE PRODUCING‘DEVICE
. Bucdette S..Swezey, Floral‘Pa'rk; N. Y., assignor to
Bell ‘Telephone Laboratories, Incorporated,
New York, N ..Y.., a corporation of New York
“Application May 21, 1942, Serial No. 443,908
‘8 vClaims. (Cl. 1'78—22)
1
'T This invention‘relates to secret telegraph trans
"mission systems. Moreparticularly, this inven
. tion relates to the preparation of key tape foriuse
‘ in enciphering andcleciphering permutationcode
‘2
position prior to the ‘start of operationslandi varied
from time to time‘as ‘desired by means of their
respective‘ sliding switches I9,‘2I,‘“26, 34, and“.
The rates of vibration of the di?erent relays are
also changed automatically as the relays vibrate
by changing the impedance of the path through
It ‘isat times important that telegraph; signals
the winding of each relay in response to‘ the op
‘transmitted ‘over telegraph lines be enciphere'd
eration of other'relays. From time to time,'at
to: prevent the disclosure of con?dential messages
random intervals, relay No.L 6 operates. Depend
to ‘unauthorized parties. One‘ system which is
probably most satisfactorily used at presentin 10 ent upon the positions‘of the right-hand arma
tures associated with'relays I to 5, magnets-1 to
enciphering Baudot code telegraph ‘signals in
* telegraph signals.
volves‘ the use of what is known in the artas a
I I" will be energized or deenergized and the cor
tapes automatically. Preferably, the system of
producing tapes should be. completely automatic
The circuit will now be described in detail. It
will be assumed that all of the armatures associ
‘atedfwithwelays I to 5' are‘ in the position indi
cated. A circuit may be traced from battery I3
through resistance» I4, contact I5, winding of re
lay I, contacti36 of ‘relay 2 which shunts resist
ance I1, variable resistance» I 8 and ‘sliding contact
I9 to'ground 51 which energizes the winding‘ of
relay l. Contact‘ H5 is closed and contact '35 is
responding perforating punches'not shown, will
key tape. Frequently more than one key tape
be selected or remain unselected in a well-known
willrb-e employed in enciphering and deciphering.
.As thenumber of teletypewrlter stations is in 15 manner. ‘When the armature of relay 6 engages
its left-hand contact, punching magnets“ will be
> creased and as the need for secrecy becomes more
energized and theitape‘will be punched in posi
important it is necessary to provide a larger num
tions where? the punches have been‘selected.
ber of key tapes. It is desirableto produce such
and should not require any manual manipulation.
It is an object of this invention to‘ produce ran
dom‘ key tapes entirely automatically. by means
of comparatively inexpensiveequipment.
lReference is made to D, B, Perry Patent
2365,120, December 2,.1941 which discloses an
arrangement wherein a group of polar relays; one
corresponding .to .each .signal element of the
.Baudot codesignals to'be enciphered are arranged
.to vlbratepeach at audi?erentspeed. Periodical
.lysaikey is operated manually. lDepen'dentupon
‘theposition assumed by the ‘various relay- arma
"tures ‘associatedrwith the' relays‘ at the moment
when‘ the‘key is operated‘, positions corresponding
to the relays in a key tape will be punched‘or re
main .unpunched. The invention herein'repre
1 sents an improvement over the arrangement dis—
closed in Patent ‘2,265,120 in that the manual op
eration of a. key is unnecessary. The circuit is
Jentirely automatic.
The invention may be better understood from
opened.
A circuit may also be traced'from ‘battery ‘ l3
through‘ resistance f4, contact‘ 4 I, winding ofv re
lay '2, variable resistance 20, sliding contact 2|
and resistance 22 to-ground51, energizing wind
-ing1 2. Contacts-4| an‘d‘35 are opened. Contact
'42‘ is closed.
A circuit maybe traced from battery I3 through
‘ resistance I4, contact 43,lwinding of‘ relay 3, vari
able inductance 23 and sliding contact 24 to
'ground 51 energizing relay 3. Contacts “and
31 are closed. Contacts ~43-and 38 are opened.
lA'circuit' may also be traced from battery I3
through‘resistance I4,‘contact 45, winding of re
the following description when read with refer
ence to the single figure of the drawing which
‘lay 4, variable resistance 25, sliding contact 26,
. shows an entirely automatic arrangement for
denser 28 connected in parallel with resistance’ 21,
'toground 51 energizing the winding of relay 4.
controlling the perforation of a key tape by‘ a
group of vibrating relays.
IRefer' now to the drawing. Five vibrating re
lays, numbered I to‘ 5, control the operation of
'contact 38,‘which shunts resistance 21 and con
Contacts “and” are closed and contact 45 vis
opened.
A circuit may be traced from battery I3 through
?vepunch-selecting vmagnets, numbered 1 to II.
wresistance I4, contact 41, winding of relay 5, in
Vibrating relay 6 controls the operation of punch- .
ing magnet I2. The armatures of relays I to 5
are all vibrated at di?erent rates of speed. The
rates at which the relays vibrate are manually
ductance 29 and contact 35, which shunts induct
ance 30, to ground 51. Contact 48 is closed and
contacts 41 and 40 are open.
A circuit may be traced from battery I3 through
resistance I4, contact 49, winding of relay 6, con
adjustable by means of rheostats I8, 2 I, 25, and 33
and variable inductance 23 which may be set in 55 tact 40, which shunts resistance 3|, inductance
2,406,046
3
32, variable resistance 33 and sliding contact 34
to ground 51 energizing relay 6. Contact 50 is
closed and contact 49 is opened.
When the right-hand armatures of relays I to
6, inclusive, engage their respective left-hand
contacts I6, 42, 44, 46, 48, and 50 parallel circuits
4
arrangement of circuit elements is shown as be
ing established by the left-hand armatures o1
relays I to 8, the actual arrangement employed
may be any desired combination of apparatus
units.
Also where a single armature or a make
or a break contact is shown, the arrangement
are established from battery I3 through resist
may provide for more than one armature and for
ance I4, through the respective left-hand contacts
front and back contacts each controlling the dis
of relays I to B, through resistances 5| to 56,
position of additional circuit elements which
through the windings of punch-selecting magnets 10 may be momentarily connected into or removed
'I to II to ground 58. Each of the right-hand
from the circuits, to further complicate the er
armatures of relays I to 5 which is in engagement
ratio vibrating action of the relays I to 5 for
I with its left-hand contact when the armature of
setting up a random selection, and to cause relay
relay 6 engages its left-hand contact 50 will close
6 to vibrate in an erratic manner to cause per
its respective circuit through its punch-selecting 15 foratins of the tape by magnet I2 in a random
magnet and when magnet I2 is energized the cor
manner.
responding selected punches will be operated to
The manner in which the punched tape is ad
punch the tape in corresponding positions in a
vanced after it has been punched is well known
well-known manner.
in the art.
The opening of the right-hand contacts asso 20
What is claimed is:
ciated with the right-hand armatures of relays
1. In a mechanism applicable for enciphering
I to 6 deenergize the windings of relays I to II.
multielement permutation code telegraph signals,
The armatures are restored to reengage their
a group or vibrating relays for determining the
right-hand contacts. Then the operation is re
individual marking and spacing elements in the
peated.
_
25 multielement cipher code and a single vibrating
Attention is particularly directed to the fact
relay for automatically controlling the register
that as the left-hand armatures of relays l to i
ing of the elements determined by said group.
are attracted and released they vary the ener
2. A mechanism in accordance with claim 1 in
gizing paths of other relays of the group. ‘This
which the rate of vibration of the vibrating re
changes the rate of vibration of the armatures 30 lays is varied in response to the vibration of
oi’ the various relays. In the case of relay I, the
said relays.
opening of contact 35 removes a shunt from
3. In a mechanism applicable for enciphering
around inductance 30. This will effect a mo
multielement permutation code telegraph signals,
mentary change in the rate at which the arma
a vibrating relay. automatic means for varying
ture of relay 5 vibrates. The operation of relay 35 the frequency of operation of said relay, and
2, by opening contact 36, inserts resistance I‘!
in series with the winding of relay I. This ef
fects a change in the speed of operation of re
lay I. The operation oi relay 3, by opening con
tact 38, removes a. short circuit from around re
sistance 21 and condenser 28 which are connected
in parallel. This effects a change in the rate of
vibration of the armature of relay 4. By the
means dependent upon the operation of said re
lay for energizing a punch magnet.
4. In a mechanism applicable for enciphering
multielement permutation code telegraph sig
nals, a vibrating relay and a tape punching mag
net controlled by said relay.
5. In a mechanism applicable for enciphering
multielement permutation code telegraph sig
closing of contact 31 of relay 3, resistance 22 is
nals, a relay conditioned to vibrate automat
short-circuited momentarily causing a variation 45 ically to determine the nature of a particular
in the current of relay 2 and an irregularity in
signal element in the cipher code, and means con
its rate of vibration. The operation of relay 4,
nected to said relay for automatically varying
by closing contact 39, connects a short circuit
the period of vibration of said relay.
around inductance 32. This effects a change in
6. In a mechanism applicable for enciphering
the rate of vibration of the armature of relay Ii. .
The operation of relay 5, by opening contact 40,
removes a short circuit around resistance SI.
This likewise e?’ects the rate of operation of re
lay 6. Sliding contacts I9, 2|, 24, 26, and 34 may
multielement permutation code telegraph signals,
a plurality of vibrating relays for determining
the character of signal elements in an encipher
ing code, and means responsive to the operation
of certain of said relays for varying the frequency
of vibration of others of said relays.
be adjusted manually to vary the amount of re
sistance or inductance of the apparatus unit with
7. .An electromechanical mechanism for pro
which each is associated. This will provide an
ducing enciphering key tape for permutation code
additional adjustment in the rate of vibration of
telegraph signals comp-rising a plurality of re
each of the associated relays.
lays having means for mutually varying their rate
It will be realized that proper adjustments may 60 of operation automatically, and means connected
be required so that magnets ‘I to I2 will be fast
to each of said relays for controlling an indi
enough to follow their respective relays I to 6
vidual signal element recording device.
and fully perform their operations. Also relay
8. In a mechanism for producing enciphering
I5 and magnet I2 should be slow enough to allow
key tape for permutation code telegraph signals,
changes in the punch selections to take place
a plurality of relays arranged to vibrate at dif
(where such changes are being called for by the
ferent rates, each relative to the other, and means
vibrating relays) between successive operations
of the punching magnet I2.
It is pointed out, that even though a de?nite
responsive to the operation of said relays for
varying the rate of vibration of said relays.
BURDE'I'I‘E S. SWEZEY.
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