AN IMPROVED DRAWING IMPLEMENT FORMING A RULE, SQUARE, TRIANGLE, SCALE, AND PROTRACTOR
Year: 1874

page_text: LETTERS PATENT to William Harvey Willson Campbell, of Norwich,
Connecticut, United States of America, now of No. 8, Southampton
Buildings, London, for the Invention of "AN IMPROVED DRAWING
IMPLEMENT FORMING A RULE, SQUARE, TRIANGLE, SCALE, AND PROTRACTOR."
A communication from abroad by Walter Smith, of Boston, Massa-
chusetts. United States of America.
PROVISIONAL SPECIFICATION left by the said William Harvey Willson
Campbell at the Office of the Commissioners of Patents, with his
Petition, on the 3rd December 1874.
I, WILLIAM HARVEY WILLSON CAMPBELL, of Norwich, Connecticut,
United States of America, now of No. 8, Southampton Buildings,
London, do hereby declare the nature of the said Invention for "AN
IMPROVED DRAWING IMPLEMENT FORMING A RULE, SQUARE, TRIANGLE, SCALE, AND
PROTRACTOR," a communication, to be as follows:—
This Invention relates to a drawing implement which forms a com-

page_text: The said improved implement is constructed of any suitable material
and of any proper size, and in form resembles the drafting implement
known as the triangle. It is provided upon the outer edges of its three
sides with division marks and numbers indicating its length in inches,
each inch measure being subdivided into fractions of the inch, one side
being divided into thirds, sixths, and twelfths, another into fifths and
-tonths, and the other into halves, fourths, and eighths.
The inner edges of the sides forming the apex of the triangle are
provided with division lines and numbers corresponding with those upon
a protractor of the ordinary construction, the inner edge of the base of
the triangle having divisions and numbers forming the chord scale for a
circle of three hundred and sixty degrees.
My improved implement is more convenient for use than the separate
instruments for which it is substituted, is not easily lost or misplaced,
and is less expensive than such instruments.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said William Harvey Willson Campbell in the Great
Seal Patent Office on the 29th May 1875..
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
HARVEY WILLSON CAMPBELL, of Norwich, Connecticut, United States
of America, now of No. S, Southampton Buildings, London, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Third day of December, in the year of
our Lord One thousand eight hundred and seventy-four, in the thirty-
eighth year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto me, the said William Harvey Willson Campbell, Her
special licence, that I, the said William Harvey Willson Campbell, my
executors, administrators, and assigns, or such others as I, the said William
Harvey Willson Campbell, my executors, administrators and assigns,

page_text: The inner edges of the sides a, b, of the triangle are provided with
division lines and numbers corresponding with those upon a protractor
of the ordinary construction, the inner edge of the base c of the triangle
having divisions and numbers forming the chord scale for a circle of
three hundred and sixty degrees.
My improved implement is more convenient for use than the separate
instruments for which it is substituted; is-not-casily lost or misplaced,.
and is less expensive than a number of such separate instruments.
This improved implement may, as above stated, be made of any suit-
able material, but for schools and other purposes where economy is an
object I prefer to make it of stiff paper or card, as it can be produced in
these materials at a very trifling cost.
Having thus fully described the said Invention, as communicated to
me by my foreign correspondent, and the manner of performing the
same, I wish it understood that I claim, an improved drawing implement
constructed with three sides provided with scales on their inner and outer
edges, as herein set forth and for the purposes specified.
W. H. W. CAMPBELL. (L.S.)