A New and Improved Combination of a Protractor and Parallel Ruler.
Year: 1894

page_text: Date of Application, 4th Oct, 1894
Con plete Specification Left, 15th Feb, 1895-Accepted, 8th June. 1895
WILLIAM HERBERT LISTER MARRINER Surgeon Craig Vaen Poole Road
Bournemouth flants do hereby declare the nature of this invention to be na
follows:-
1 A parallel ruler with a longitudinal sht through the centre of the upper
portion of the rule.
2. A plate of suitable dimensions called the protractor plate, which slides along
the upper portion of the ruler, and is provided with guides on its under surface
which fit in the slit in the ulei so that it can only move longitudinally.
3 A smitable clamp by which the protractor plate may be fixed in any desned
position or positions.
4. A protractor, 18 fixed by suitable means to the upper edge of the protractor
plate. At the radial centre of the protractor is a hole of suitable diameter in
which is inserted glass or other similar material., In the centre of the glass a
small perforation is made All the middle part of the protractor not required for
the mat king of the usual divisions and for the support of the glass are cut away.
This combined protractor and ruler may be made of Gorman silver or any other
suitable material.
Dated thus and day of Antah. 1001
W. H. L MARRINER,
Applicant.
A New and Improved Combination of a Protractor and Parallel
Ruler.
WILLIAM HERBERT LISTER MARRINER Surgeon "Craig Vaen," Poole Road
Bournemouth, Hampshire 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 —
In Fig 1. F is an ordinary 18-in. parallel ruler made of wood, vulcauite, ebony
or other material bevelled all round as shown in the section Fig. IV in which a
deep rectangular groove is cut tuch wide, m. deep along the centre of the upper
edge of the rule, & extending to within one inch of either end of the ruler; on
the top of this groove a "guide" G Fig. 1 (made of biass or other metal.
thick & in wide & having a slit in. wide cut out from the middle within in of
either end of the guide) is fixed by small screws inserted from the under side of
the ruler & filed flush with the woodwork of the ruler above & below. This guide
is to be let in to the woodwork of the ruler till the upper surfaces of each are
[Price 8d 1

page_text: $6
level. In this guide" the protractor plate, moves, marked c. Figs. I. III & IV.
This is a piece of suitably strong metal, shaped, in the first instance as in Fig III,
& then bent in the direction of its length as in Fig. IV; on the under side of this
plate are two rectangular studs E. E. fixed which fit into the guide G Fig. I
allowing the protractor plate c to travel the length of the ulei, without over-
lapping the ends. To this plate is attached, a metal protractor F gs I II & IV A,
by six small screws, as in Fige I & III The protractor is of the form shown in
Fig. I being one complete half circle & a little more. B Fig. II is a small disc,
of glass, horn or other transparent material through which a small hole is drilled,
this hole is the exact centic of the protractor. The glass B is fitted into the
frame of the protractor as shown in Figs. I & II. The upper edge of the plate c
when attached to the protractor, should be in line with the hole in B, & thus leave
an exact circle to be divided into degrees as in Fig. I A. The protractor plate
is now placed in the guide of the ruler F & is attached thereto by the clamp screw
and milled head nut D Figs I. III and IV. The form of the clamp screw is
shown in Figs. 5 (side and end view) and the method of attaching it to the ruler
& protractor is shown in Fig. IV which is a section of the ruler taken
through ABD Fig. I The position of the centre bole B when the inler is
completed will be inch from the edge of the ruler & the 90° mark of the
protractor exactly at right angles to that edge
The clamp screw Fig. V can be either put in its place before the guide G 15
screwed to the ruler, or inserted in the guide by boring a sufficiently large hole
from the under side of the rule anywhere along the groove till the groove is
bored into.
The ruler and protractor is principally intended for the setting of ships' courses
and laying off bearings on navigational charts.
Having now particularly described and ascertamed the nature of my said inven-
tion and in what mannet the same is to bo performed, I declare that what I
claim 18:
The method of combining a moveable protractor and a parallel ruler.
Dated this 14th day of Wa100=