Year: 1888

page_text: Date of Application, 25th Aug., 1888
Complete Specification Left, 28th Dec., 1888
Complete Specification Accepted, 5th Feb., 1889
I GEORGE CHARLES LILLEY of 10 London Street in the City of London Compass
Maker do hereby declare the nature of this Invention to be as follows:-
This Invention relates to protractors whereon the angular divisions are marked on
a straight edge and the principal object of my Invention is to provide a protractor of
this description which can be used with great facility in laying off the course of a
ship upon a chart.
According to my Invention I construct the protractor so that it can be moved
lengthwise without displacement laterally by which means it can with the greatest
facility and exactness be brought from the position shewing the track to that of
coincidence with the meridian line for indicating the true course.
The arrangement which I prefer consists in making the protractor with a long slot.
in it extending nearly throughout its whole length and in this slot is situated a piece
which can be held down firmly in a fixed position upon the chart whilst the protractor
proper is moved lengthwise the said piece and the protractor proper preferably
engaging together by a tongue and groove connection.
If the protractor be arranged to move upon rollers instead of upon the aforesaid
piece in the slot I provide rollers whose length is situated transversely to the length
of the protractor and in combination with these transverse rollers I may use rollers
situated at right angles to the transverse ones the two sets of rollers being mounted
in such a manner that either set can be brought into use according to whether the
protractor is to be moved lengthwise or in the direction of its breadth.
Dated this Twenty fifth day of August 1888.
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C.,
Agents for the said George Charles Lilley.

page_text: I GEORGE CHARLES LALLEY of 10, London Street, in the City of London Compass
Maker 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 protractors whereon the angular divisions are marked on
a straight edge and the principal object of my Invention is to provide a protractor
of this description which can be used with great facility in laying off the course of a
ship upon a chart.
According to my Invention I construct the protractor so that it can be moved
lengthwise without displacement laterally by which means it can with the greatest
facility and exactness be brought from the position shewing the track to that of
coincidence with the meridian or parallel line for indicating the true course.
The simplest form of a protractor constructed according to my Invention is shewn
in plan in Figure 1 and in transverse section (on the line 1. 2. Figure 1) in Figure 2
of the accompanying drawings. It consists in making the protractor A with a long
slot a in it extending nearly throughout its whole length and in this slot is situated
a piece B which has its underside flush with the underside of the protractor A and
can be held down firmly in a fixed position upon the chart whilst the protractor A is
moved lengthwise the said piece B and the protractor A engaging together by a
tongue and groove connection or by the edges of the groove and engaging sides of
the part. B being slightly wedge shaped and having holding and guiding pieces C
secured to the part B by screws e. Figure 3 represents in plan Figure 4 in transverse
section (on the line 3. 4. Figure 3) and Figure 5 in longitudinal section (on the line
5,6 Figure 3) an arrangement wherein rollers are used upon which to move the
instrument on the chart in a direction transversely to its length in combination with
the herein before described arrangement for moving it lengthwise. As before A is the
protractor a the slot therein and B the piece engaging in the slot. Dis the rod or
axis mounted in bearings d and carrying the rollers d upon which the protractor can
be moved transversely of its length as is usual with parallel rulers. The piece B is
provided with a sleeve. b secured thereto. through which the rod or axis D passes so
that when the piece B is held down the protractor can be moved lengthwise as herein-
..before described.

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 :-
1st. A straight edge protractor provided with means substantially as hereinbefore
described for enabling it to be moved lengthwise without displacement laterally.
2nd. The straight edge protractor hereinbefore described and illustrated in Figures 1
and 2 of the accompanying drawings.
3rd. The straight edge protractor hereinbefore described and illustrated in
Figures 3, 4 and 5 of the accompanying drawings.