Year: 1887

page_text: Date of Application, 15th Apr., 1887
Complete Left, 16th Jan., 1888
Complete Accepted, 13th Apr., 1888
PERCY FRY KENDALL of 14 St. Bees Street, Moss Side Manchester, Student, do
hereby declare the nature of this invention to be as follows:-
It consists of a magnetic compass which is to be attached to the top of the core,
either by a spring-peg, cement, or other means before the core is detached from the
parent rock, and then by the release of a spring the compass needle shall be securely
locked.

page_text: PERCY FRY KENDALL of 14 St. Bee's Street, Moss Side, Manchester in the County
of Lancashire assistant lecturer at the Owen's College, 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 :-
It consists essentially of a magnetic compass which can be attached by means of a
peg or cement to the top of the core left standing by the boring-tool & the needle of
which is automatically locked by the release of a spring upon the withdrawal of the
lowering-tool.
Figure 1. is a section drawn through the median plane.
A. is the box of the compass.
B. is a strong lid screwed on.
C. is a glass inner lid held in place by a screw-collar.
D. is a pillar upon which the compass-card E is borne.
F. is a tube sliding upon D having a flange near the top and its upper edge being
serrate. Encircling this is a spiral spring pressing beneath the flange and tending to
force the tube upward so that its toothed edge would grip the compass-card against
the glass lid. To prevent any rotation of the tube a slot runs down one side in which
a pin fixed in the pillar D. works.
G. is a lever-catch to hold down F. by the flange when the instrument is set. It
turns upon a pin in the floor of the compass box.
H. is a trigger in the floor of the compass-box hinged on to G. and having a flange
against which a spiral spring presses so as to throw over the lever-catch and allow the
tube F. to ascend and grip the card bearing the needle.
To counteract any tendency of the card to slide upon the toothed edge of the tube a
ring of india-rubber is cemented to the under side of the card so that the teeth shall
embed themselves.
The method of using the instrument is to insert it in the lowering-tool which shall
hold the trigger H drawn out. When the instrument shall have become firmly
attached to the core and a sufficient time have elapsed to allow the needle to come to
rest the lowering-tool shall be withdrawn releasing the trigger which will throw over
the lever-catch && permit the tube F. to ascend & lifting the card off its bearing
press it firmly against the glass lid. The core may now be detached from the parent
rock and drawn to the surface, when by unscrewing the lid B. the orientation of the
core may be read off.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. The application of an automatically locking magnetic compass for the purpose
specified.
2. A serrate tube impelled upward by a spring substantially as & for the purpose
specified.
3. A lever-catch substantially as specified, in combination with a trigger impelled
substantially as & for the purpose specified.
101 1
1000