AN IMPROVED ATTACHMENT FOR SQUARES FOR BUILDER'S AND JOINERS' USE
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
I, ALEXANDER MELVILLE CLARK, of the firm of A. M. and Wm. Clark, of
53, Chancery Lane, in the County of Middlesex, Fellow of the Institute of Patent
Agents, do hereby declare the nature of the said Invention for AN IMPROVED
ATTACHMENT FOR SQUARES FOR BUILDER'S AND JOINERS' USE," a communication
to me from abroad by Andrew Gustave Olson and John McFarlane, both of
Duluth, St Louis Country, State of Minnesota, United States of America, to be
as follows:-
This invention consists in an adjustable scale or divided measuring attachment
for squares for builders or carpenters and joiner's use, whereby increased facilities
are afforded for measuring or laying out rafters, also for bevelling the toes and heels
thereof, likewise for laying out stairs and other purposes or uses, substantially as
hereinafter described.
The square is of the usual flat steel form such as used by mechanics and its
tongue and blade are graduated with the usual measurements or divisions.
The attachment consists of a flat measuring bar or rule having inch measurements
on its upper face with the necessary subdivisions, and formed of L section or with
a fence along one edge graduated with a scale of half an inch to the inch on the
side which forms the fence; on its under face it has a scale of two inches to the
foot. At the one end of this bar, on the upper face thereof, is a fixed elongated
open ended jaw provided with a set screw and adapted to embrace the tongue of
the square; and, adjustable on and along or over the face of said bar, by means of
a longitudinal slot, in the bar, and a sliding stud or rivet, is another elongated open
ended jaw having a set screw and adapted to embrace the blade of the square the
attachment extending obliquely across from the tongue to the blade.
To use the attachment for making a rafter pattern, take as many inches on the
tongue of the square as will correspond by scale, to the elevation of the roof of the
building and " even or set the corner of the attachment to such measurment on
the outer longitudinal margin of the tongue, the tongue of the square lying in
Pine Cr
"

page_text: between the bar and its fixed jaw. Then take as many inches on the blade of the
square, which passes in between the bar and its adjustable jaw as will correspond
by scale, to one half the width of the building and screw down the set screws.
This will give the length of the rafter on the upper face of the attachment at
the point where it and the square intersect. The bevels for the toe and heel cuts
will be given by placing the square on the rafter with the attachment, by the fence
against its face side.
The attachment can be used on all kinds of bevel work and in its combination
with an ordinary square will be found far superior to a bevel square.

page_text: COMPLETE SPECIFICATION.
"
I, ALEXANDER MELVILLE CLARK, of the firm of A. M. and Wm. Clark, of
53, Chancery Lane, in the County of Middlesex, Fellow of the Institute of Patent
Agents, do hereby declare the nature of the said Invention for "AN IMPROVED
ATTACHMENT FOR SQUARES FOR BUILDERS AND JOINERS USE (a communication
to me from abroad by Andrew Gustave Olson and John McFarlane both of
Duluth, St Louis County, State of Minnesota, United States of America) and in.
what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:-
This Invention consists in an adjustable scale or divided measuring attachment
for squares for builders or carpenters and joiners use, whereby increased facilities
are afforded for measuring or laying out rafters, also for bevelling the toes and
beels thereof, likewise for laying out stairs and other purposes or uses, substantially
as hereinafter described.
Reference is to be had to the accompanying drawing forming part of this
specification in which similar letters of reference indicate corresponding parts in
all the figures.
Figure 1 represents a face view of a square with the improved attachment
applied Figure 2 is a side view of the attachment, in part; and Figure 3 a
transverse section of said attachment.
The tongue A and blade B of the square have the usual measurements or divisions
on them. C is the attachment which consists of a flat bar or rule having inch
measurements on its face b, with the necessary subdivisions, and a scale of half
inch to the inch on its side which is constructed to form a fence c. At the one end of
this bar, on the face b thereof is a fixed elongated open ended jaw d provided with
a set screw e; and adjustable on and along or over the face of said bar, by means
of a longitudinal slot f, in the bar and a sliding stud or rivet g, is another elongated
open ended jaw h having a set screw i.
To use the attachment for making a rafter pattern, take as many inches on the
tongue A, of the square as will correspond by scale, to the elevation of the roof of
the building and " even or set the corner m, of the attachment to such measure-
ment, on the outer longitudinal margin of the tongue as shown in Figure 1, the
tongue of the square lying in between the bar and its fixed jaw d. Then take as
many inches on the blade B, of the square, which passes in between the bar and
its adjustable jaw h as will correspond by scale, to one half the width of the
building, and screw down the set screws e i.
This will give the length of the rafter on the face b, of the attachment at the
point where it and the square intersect. The bevels for the toe and heel cuts will
be given by placing the square on the rafter with the attachment by the fence c
against its face side.
For laying out a brace pattern, the attachment and square are used in the same
way but for short braces and rafters, the scale on the attachment should be one
foot for every two inches to provide for which the scale of two inches to the foot
is arranged on the one side.
i

page_text: The device may also be used for laying out the elevation of stairs, by taking one
inch on the tongue of the square for every inch in height of the rise, then taking
as many inches on the' blade as there are in the width of the step and a perfect
templet is obtained far superior to a board and the trouble of making such
avoided.
The attachment can be used on all kinds of bevel work and in its combination
with an ordinary square will be found far superior to a bevel square.
The ordinary length of the attachment will be twenty four inches. It may be
made of steel iron, brass or other suitable material and of any required thickness.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is
1. The within described attachment for a right angled square having graduations
on its tongue and blade, the same consisting of a measuring bar or rule C formed
with a face c, along one edge provided with a fixed open ended jaw d, at its one
end and with an adjustable or sliding open ended jaw h, and means applied to said
jaws for securing the attachment when set on the square, substantially as and for
the purposes specified.
2. The longitudinally slotted measuring bar C constructed with a fence c, along
its one edge or side and having different scales on its slotted face and fence side, in
combination with the fixed open ended jaw d, at the one end of its face, provided
with a set screw e, and the longitudinally adjustable or sliding open ended jaw h
having a set screw i, the whole being adapted for use in connection with a carpenter
and builders or other like square essentially as described.
T11: 0011
1