A New or Improved Device for Transmitting the Readings of Logs to the Bridge or other Parts of a Steamer or Ship, also applicable for Indicating the Revolutions of the Engines.
Year: 1893

page_text: Date of Application, 15th Aug., 1893
Complete Specification Left, 15th May, 1894-Accepted, 16th June, 1894
PROVISIONAL SPECIFICATION.
A New or Improved Device for Transmitting the Readings of Logs
to the Bridge or other Parts of a Steamer or Ship, also
applicable for Indicating the Revolutions of the Engines.
We, GEORGE THOMSON WHISH, of Devon Villa, Crosshill, Glasgow, Master
Mariner, and JAMES HOGG AMOUR, of Glenview Cottage, Cambuslang, Engineer,
do hereby declare the nature of this invention to be as follows:-
"
This invention relates to a device for transmitting the readings of "taffrail'
log to the bridge or other parts of a steamer or ship, and consists of an electric
battery and wires, said wires being connected to the log on the taffrail of steamer
and laid to the bridge or other desired part of steamer, and terminating in a
clockwork arrangement consisting of a toothed wheel and escapement, and a clock
spring which is wound up at intervals, also having attached a pointer and dial to
show the miles or fractions of a mile, or a toothed wheel and ratchet to work the
pointer.
The action of the arrangement is as follows:-Fitted to the top of the log is
a wire leading to the registering apparatus, making and breaking contact, thereby
causing the escapement to move or work the ratchet. Each time contact is made
the escapement or ratchet is moved one tooth, corresponding to the movement of
the pointer on the log; consequently both the pointer on the log dial on taffrail
and the pointer on the steamer's bridge, or other desired place will register the
same.
It is also to be understood that the same arrangement is applicable for indicating
the revolutions of the engines on any part of the steamer.
Dated this 14th day of August 1893.
BOTTOMLEY & LIDDLE,
154, St. Vincent Street, Glasgow, Applicants' Agents.
COMPLETE SPECIFICATION.
A New or Improved Device for Transmitting the Readings of Logs
.
to the Bridge or other Parts of a Steamer or Ship, also
applicable for Indicating the Revolutions of the Engines.
We, GEORGE THOMSON WHISH, of Devon Villa, Crosshill, Glasgow, Master
Mariner, and JAMES HOGG AMOUR, of Glenview Cottage, Cambuslang, Engineer,
do hereby declare the nature of this invention and in what manner the same is to
be performed to be particularly described and ascertained in and by the following
statement :-
This invention relates to a device for transmitting the readings of a taffrail log
to the bridge or other parts of a steamer or ship. It consists of a taffrail log
connected by wires to the electro-magnet of the recording apparatus. The taffrail
log is arranged so as to make and break the circuit of the electro-magnet of the
recording apparatus by means of a cam or cams or one of the spindles of the log.
The recording apparatus consists of a clockwork driven by a spring which is wound
up at intervals. The escapement of the clockwork is controlled by the armature
of the electro-magnet. The same arrangement is applicable for indicating the
revolutions of the engines at any part of the steamer.

page_text: In order that our invention may be properly understood and readily carried into
effect we have hereunto appended two explanatory sheets of drawings in the
several figures of which corresponding parts are marked with the same letters of
.reference.
Figure 1 is the taffrail log with part of the casing cut away.
Figure 2 is a cross section of the taffrail log.
Figure 3 shows the clockwork of the recording apparatus.
Figure 4 represents the dial of the recording apparatus.
In carrying out our invention we alter the taffrail log in ordinary use in a simple
manner, utilizing the mechanism which in the log is made to ring the bell in
order to make and break the circuit of an electro-magnet in the recording
instrument.
On one of the spindles a of the taffrail log there is a cam or cams b b, and a
pawl e pivoted at d is actuated by the cams b. Fixed to the pawl c there is an
arme which acts on the metal piece of pivoted at g. As the pawl c rises on the
cam 6 the metal piece f is turned and brings the two metal springs h and i in
contact. The spring is connected to the terminal.j which is insulated from the
case of the log, while the spring i is connected through the case to the terminal k.
Thus by the revolution of the spindle a the two terminals j and k are metalically
connected and disconnected. The terminals ; and k are connected by wires to the
circuit of the electro-magnet / of the recording apparatus so that the revolution of
the spindle a of the log makes and breaks the circuit of the electro-magnet. The
armature m of the electro-magnet is connected by a pivoted bar n to the escapement o
of the clockwork so that the movement of the arinature to and from the poles of
the electro-magnet controls the motion of the clockwork. Thus the revolution of
the log controls the motion of the clockwork, and the indications of the log are
transmitted to and recorded on the dial of the recording instrument. The dial is
provided with two indicators; one to register the number of miles traversed, and
the other, divisions of the mile.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
The combination of taffrail log and recording apparatus arranged to record
the indications of the log in any convenient part of the ship, substantially as
.described.
D
1
BOTTOMLEY & LIDDLE,
154, St. Vincent Street, Glasgow, Applicants' Agents.