A MATHE- MATICAL DRAWING INSTRUMENT OR COMPASS
Year: 1885

page_text: We WILLIAM THOMAS SMITH and CHARLES SMITH both of 288 Icknield Street,
Hockley Birmingham in the County of Warwick Opticians and Pencil Case
Manufacturers do hereby declare the nature of said Invention for "A MATHE-
MATICAL DRAWING INSTRUMENT OR COMPASS" to be as follows
1
Our Invention has for its principal object to provide a simple convenient compact
and inexpensive instrument for mathematical drawing such as are commonly called
Compasses, especially adapted for the use of Schools
According to our Invention we form a tube on one leg of the Compass and for
insertion into this tube we provide a double ended device either end of which can
be inserted into the tube the other end projecting therefrom-This device may be
a combination of a propelling pencil situated at one end and a pen-holder for
carrying an ordinary reversible nib at the other end or the pen may be a pen like
those used in Mathematical Drawing Instruments or any other two instruments
useful for the purpose may be used one at each end of the device so that when one
or other of the instruments is required for use that at the other end is inserted into
the tube in the leg of the compass and constitutes the support for the instrument
which is for the time being in use The opposite leg of the compass may terminate
in an ordinary point or it may be formed with a tube like that on the other leg the
point being on one end of a piece which can be withdrawn from the said tube and
reversed so that the point is safely covered when the Compass is not in use, and for
a similar purpose the double ended device for placing in the other leg may be
formed in two parts so that when the instrument is to be carried in the pocket the
one end of the double ended device can be reversed and housed in the tubular
portion of the other end of the device so as to leave no point of either pen pencil
or metal projecting when the instrument is not in use.

page_text: COMPLETE SPECIFICATION
I WILLIAM THOMAS SMITH and CHARLES SMITH of 288 Icknield Street
Birmingham Pencil Case and Penholder Manufacturers do hereby declare the
nature of our invention for MATHEMATICAL DRAWING INSTRUMENT OR COMPASS
and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement
-
Our invention consists in the construction of an ever pointed pencil case and
other like holder for pen such for example as solid black lead and steel pen whereby
the part containing the lead is inserted in a hollow tube and reversed either way
for the use of the pen or lead pencil.
For convenience of description we will describe our invention in connection with
a Mathematical Drawing Instrument or Compass
The part containing the solid lead or writing material which part 18 commonly
called the movement is one end of tube and the part containing the holder for pen
18 at reverse end this said tube fits in the hollow tube of Mathematical Instrument
or Compass by sliding it down and 18 free to slide in or out or reverse ends as the
case may require
We will now proceed to describe with reference to accompanying Drawings the
manner in which our invention is to be performed
Figure 1 represents all the different parts of the invention applied to a Mathe-
matical Drawing Instrument or Compass
Figure 2 represents the tube that slides in the hollow tube with its movement
containing the solid lead or writing material and at reverse end holder suitable for
holding a pen
J
Figure 3 represents the Mathematical Drawing Instrument or Compass one leg of
which 18 of solid material and tapering off to point, the other leg being of part solid
and part tubing and constructed to hold the sliding tube containing the movement
for solid lead or writing material, and the holder suitable for pen, the part taking
the position as represented in Figure 1.
Having now described the nature of our invention and the manner in which the
same is performed we wish it to be understood that we claim as our invention
Improvements in Mathematical Drawing Instruments or Compasses
Constructing and arranging the parts of the said Mathematical Drawing Instru
ment or Compass herein before described and illustrated in the accompanying
Drawings whereby a movement containing the solid lead or writing material and a
holder suitable for pen slides and fits into a hollow tube with reverse action and
substantially operates in the manner described and illustrated