Electrical Log Recording Instrument for the Cabin.
Year: 1898

page_text: Date of Application, 25th Jan., 1898
Complete Specification Left, 12th Sept., 1898-Accepted, 23rd Dec., 1898
TROYIUNAL DREVIFICATION.
Electrical Log Recording Instrument for the Cabin.
I, PETER JENSEN, of 77, Chancery Lane, London, Chartered Patent Agent, do
hereby declare the nature of this invention, a communication to me from abroad
by Patentaktiebolaget Svea, of Stockholm, Sweden, to be as follows:-
This invention relates to electrical ship logs and has for its object, in combina-
tion with an ordinary mechanical log of the taff rail or other type, to give in any
convenient place of the vessel, say the navigation cabin, a true synopsis of the
miles travelled and to give a reliable signal on one or more electric bells when
the ship has passed a certain distance.
The instrument consists of a movement worked by a spring and electrically
combined with a contact device applied to the taff rail log, and a registering
instrument combined with and partly worked by the aforesaid movement.
A movable armature when attracted by its electro magnet, strains the spring
and when the current is broken, the spring draws the armature back, when a pawl
on the armature turns the pawl wheel one tooth. By this arrangement the power
working on the wheel is always the same and not depending on the strength of
the batteries, as the case would be if the pawl were to turn the wheel when the
armature was attracted, for the current might then be too powerful giving the
wheel too much speed and perhaps making it turn two or more teeth.
This movement moves a hand on a dial graduated in miles exactly following
the mechanical log which by a contact device closes the current through a cable
and the electro magnet in the movement, each quarter of a mile.
On this dial which is insulated from the mechanism and the hand is con-
centrically placed a movable ring graduated as the dial itself but numbered 'in
the opposite direction. In the zero division hereof is a contact spring so placed
that it is touched by the hand when it passes, in order to close a circuit through
one or more electric bells and thus give the signal when the hand passes the
spring.
If the ring is turned till a certain number on the same is opposite the hand, a
signal will be given after the vessel has passed the number of miles.
A registering instrument is arranged on a clock-work so that a roller fastened
on the prolonged minute arbor thereof draws a paper tape along, marking it
at each revolution by means of a little sharp peg near one end of the roller and
opposite the minute hand i.e. marking it at each full hour. A lever is placed so
that one end thereof also carrying a peg is just under the roller and under the
other end is an electro magnet the armature of which is held by the lever. This
electro-magnet gets a current closed at each mile from the instrument thus by
the peg on the lever marking the tape each full mile travelled.
T
1000

page_text: Electrical Log Recording Instrument for the Cabin.
I, PETER JENSEN, of 77, Chancery Lane, London, Chartered Patent Agent, do
hereby declare the nature of this invention (a communication to me from abroad
by Patentaktiebolaget Svea, of Stockholm, Sweden,) and in what manner the same
is to be performed to he particularly described and ascertained in and by the
following statement:-
-
This invention relates to electrical self-registering ship logs, and the object of
the invention is to furnish a reliable instrument which can be put in any con-
venient place on board the vessel, giving a true statement of the log. The instru-
ment is connected by means of a cable or otherwise to a contact mechanism giving
a suitable number of contacts per mile to the part of the instrument that points
out the distances on a dial graduated in miles or the like. This contact mechanism
can be attached to an ordinary taffrail log, and set in motion thereby. According
to this invention a mark is made at the side of a tape for each hour and in the
middle of the said tape each mile or other distance run is marked out by a dot so
that it can be seen how many miles or the like in a certain hour have been run
with more or less speed than usual. The instrument points out the miles exactly
according to the taffrail log; it registers the miles or knots per hour; and gives if
desired signal on one or more electric bells when a certain distance has been
travelled.
The instrument can be put up in any cabin on board and two or more instru-
ments can be connected, working exactly alike in different parts of the ship. This
invention will enable the navigator to read off the log in the navigation cabin
or chart room and he can rely on being called by the bell after the vessel has
run a certain distance.
In the accompanying drawing Fig. 1 shows the instrument on a reduced
scule. Fig. 2 is a portion of the dial natural size. Fig. 3 is a broken sectional
elevation of said dial showing one method of insulation. Fig. 4 is the contact
device and operating mechanism. Fig. 5 is the registering mechanism and
Fig. 6 is the registering tape, the dots in the middle being miles and those at the
side marking each hour. Referring to Figs. 1, 2, 3 and 5, 1 is a case containing
the mechanism that operates the hand 2 round the dial 3, hereinafter explained
with reference to Fig. 4, 4 is a small hand which revolves at-say-one-tenth of
the speed of the hand 2, 5 is a ring insulated from the movement and the hand 2
and capable of being revolved on the dial 3, 6 is al contact spring
electrically connected to the ring 5 and SO that it touches the
hand 2 when the latter passes. 7 is al knob with which to turn
the ring. The ring 5 from the knob 7 at 0 is graduated and numbered in a
direction opposite to the graduations on the dial 3. The contact-spring 6 is
connected through the ring and the dial 3 with a battery and the hand 2 is
connected with one of the connecting screws 8 and 9 between which screws a
circuit with one or more electric bells is inserted. 10 is a bell also in this circuit
which can be cut out by the switch 11. The screw 12 is for
connecting the cable from the contact device Fig. 4, going to the electro
magnet 37, which circuit is closed for each mile or quarter of a mile. 13 goes to
the registering mechanism to the electro magnet 24 where the circuit is closed only 4
once for each mile, 14 is the return wire for both. 15 is a clock. On the prolonged
spindle for the minute hand is fastened a roller 16 (also Fig. 5) for drawing
the paper registering tape 39. On this roller near the end opposite to the minute
hand is a peg 17 (see Fig 5). To hold the paper tape against the roller 16, there
is another roller 18 (see also Fig. 5) pressed against the upper roller 16 by means 5

page_text: of a lever 19 adjusted by a spring 20. 21 is another lever ending under the roller 16
with a peg 22 (see Fig. 5) and carrying at its other end the armature 23 to an
electro magnet 24. 25 is a small hand fastened to or made in one piece with the
support 26 and pointing down to the place where the peg 17 is when the minute
hand is at 12 o'clock. 27 is the barrel for carrying the tape. 28 is a small flanged
wheel guiding the tape.
Fig. 3 shows besides one way of insulating the ring 5 from the hand 2,
the connection to one end of the circuit. 29 is the insulating material,
30 is a nonconducting piece insulating the screw 31 from the move-
ment and the hand. Round the screw head 31 the connecting wire is
fastened. Referring to Fig. 4, 32 is a spring attached directly or indirectly to a
pawl 35 by which means the wheel 333, which is secured on the spindle 40 of a worm
which gears into a wormwheel (not shewn) secured on the arbor of the hand 2, is
moved one tooth at a time. 34 is a detent holding the wheel 33 when the pawl 35
is pulled down by the armature 36 being attached by the electro magnet 37.
The arrangement of the spring operated pawl may be varied for instance the
pawl may be connected indirectly to the armature or when the electric circuit is
closed the spring may be compressed instead of strained. Fig. 6 shows a piece
of registering tape, the dots at the side of the paper representing the marks for each
hour the ones in the middle the miles; the mark 38 is made on the tape when the
registering begins. When the instrument is to be used the hands 2 and 4 may be
set at 0, but it is not necessary if the number of miles pointed out by the hand
are noted. If a signal is wanted after, say forty miles run, the ring 5 is turned
by the knob 7 till 40 on the ring is opposite the hand 2. The clock 15 having
been wound up is set right and a mark 38 Fig. 6 is made on the paper tape, the
time on the clock is written in pencil close to this mark and the paper tape is
placed between the rollers 16 and 18, so that the mark is just under the hand 25.
When the log in the water has run a quarter of a mile the contact mechanism
closes the circuit through the electro magnet 37 the armature 36 is attracted
the ratchet 35 is pulled down taking hold under another tooth of the wheel 333 and
the spring 32 is strained. When the current is broken again the spring draws
the pawl back which turns the wheel one tooth which motion moves the hand 2 by
a quarter of a mile graduation on the dial 3 and so on. When the hand touches
the contact spring 6 the circuit is closed through the contact screws 8 and 9 and
all the bells, which are not cut out of the circuit, ring. One of the bells say one
on the bridge must not be cut out as it can happen that all the bells would be cut
out at the same time and no signal would be given. The registering instrument
receives a current at every mile, through the contact-screw 14 whereby the electro
magnet 24 attracts the armature 23 thus pressing the peg 22 on the lever 21
into the paper tape. Each hour when the minute hand points to 12 the peg 17
is inserted in the paper tape just where the hand 25 points on the tape. This
hand therefore always points on the paper to the point that represents the hour on
the clock. The dots marking the miles can thus easily be counted by the hour or
totalled. The distance between the mile dots represents the speed made for each
mile and can easily be measured by a scale.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, as communicated to me by my
foreign correspondent, I declare that what I claim is:
-
1. The arrangement or combination of parts forming electrical ships log record-
ing instruments substantially in the manner herein described and shown.
2. In a ships log recording instrument in which a hand moving round a suitably
graduated dial indicates the number of miles or other distances travelled the
mechanism for operating the said hand consisting of an electro magnet, an
armature attached directly or indirectly to a pawl, a spring connected directly or
indirectly to said pawl and a ratchet wheel mounted on the spindle of a worm
which gears into a wormwheel mounted on the arbor of said indicator hand and

page_text: operated by said pawl whereby, when the electric circuit is closed, the armature is
attracted and said spring is thereby either compressed or placed in tension so that
on the circuit being broken said spring operates said pawl and thereby causes said
ratchet wheel to be revolved by one tooth substantially as described and shown.
3. In a ship's log recording instrument where a hand on a scale suitably graduated
in miles or the like shows the distances travelled, the employment of another
scale 5 concentrically movable outside or inside of the first one, correspondingly
graduated but numbered in the opposite direction and insulated from the hand
having at its 0 point a contact-spring 7 so placed that it is reached by the hand
when same passes, thus closing a circuit through one or more electric bells in order
to give a signal when a certain number of miles are travelled substantially as
described and shown.
4. In a ships log recording instrument having a scale suitably graduated in
miles or the like and a hand to indicate the miles or other distances travelled the
combination with a clock of a tape feeding roller mounted on the minute hand
spindle and provided with a tape marking peg at a point opposite to the centre
line of said minute hand whereby the tape is marked at every hour, a lever provided
with a tape marking peg at one end and an armature at the other end thereof
and an electro magnet whereby each time the electric circuit is closed at given
distances the said tape is marked substantially as described and shown.
Th
1000
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.