Year: 1886

page_text: Date of Application, 8th Oct., 1886.
Complete Left, 8th July, 1887.
Complete Accepted, 9th Aug., 1887.
from and into St. Petersburg Standards and Aliquot Parts.
I GEORGE BOUSFIELD of No. 3 Sylvan Crescent Hainton Street Great Grimsby
Commercial Traveller in the Timber Trade do hereby declare the nature of this
invention to be as follows:-
This rule has been constructed with a view primarily to simplify the measuring of
round, square and unsquared timber which necessarily forms a considerable part of a
timber buyer's business, but at the same time, is capable of an exhaustless variety
of uses, in the computation of all the various and abstruse calculations found not only
in the timber, but all other kindred trades such as brick, stone, glass etc.
The frame of the rule is 12 inches long and marked on one edge in inches and parts
and on the other bevelled edge is contained a ; ; ; scale and the slide or
middle part is about 13 inches long, 12 of which only need be divided in order that
when the same is drawn out to the extent of its divided part the rule will measure
just 2 feet and can be used in the same way as an ordinary 2 foot rule, being marked
on one edge and down the centre on one side, for this purpose.
On one side the divisions are arranged decimally, and on the other duodecimally,
that is to say, one side is divided into feet, inches and parts, whilst the other is
divided into feet and decimal parts of a foot or units, tens and hundreds. The face of
the decimal side comprises six scales. Reckoning from the right hand side the second
third and fifth scales consist of two radii each, whilst the sixth or girth line is a single
radius, extending from 4 to 40.
The numbers advance in a tenfold proportion in each radius, according to the value
you place upon the first.
Thus if the 1st 1 represents one-tenth the middle 10 will represent 1, and the
end 100 will represent 10, or if the first 1 represents unit, the middle 10 will be 10
and the end 100 and so on, the intermediate divisions following in like proportion.
The decimal side is constructed on the same principle as the ordinary brass slide in
a carpenter's slide rule, with the exception that the ordinary brass slide is worked

page_text: horizontally and my slide is moved vertically and the Figures being large are thus far
more discernible, so that whatever the ordinary brass slide is capable of the same can
be effected and with greater ease and accuracy by this side of mine alone.
The duodecimal side comprises 7 scales or radii. The outer left and right hand
scales are decimally arranged for use when deciphering decimal parts of a multiple
number.
The second on the left is a duodecimal scale ranging from 100 to 1.
The duodecimal scale on the two outer edges of the slide correspond to each other
and range from 5 inches to 80 feet.
The scale on the frame opposite to the right of the slide is a duodecimal scale
ranging from 1 inches to 150 feet.
The central scale on the slide contains Standard quantities that is to say a graduated
scale on the logarithmic principle ranging from 3 parts (or 18 f. 3 x 11 in.) to
5 Standards.
This scale is so constructed that the Standard quantities indicated increase or
decrease on the logarithmic principle in the same way as by the same rule the opposite
scales on the frame (in the well known manner) increase and diminish respectively.
It will thus be seen, that in this my invention I have combined in one instrument
a scale for taking of quantities from plans, a decimal slide capable of working all the
various problems now obtained by the brass slide, also the duodecimal scale for cubing
round, square and unsquared timber or scantling, and lastly a graduated scale of
Standard measurements by which a comparison between lineal superficial and cubic
feet of any size and the relative St. Petersburg Standard measurement can be seen
without calculation besides the advantage of an ordinary two foot rule which
combination has not been attempted before.
Dated this 8th day of October 1986

page_text: · Improvements in Slide Rules Specially Applicable for Reducing
from and into St. Petersburg Standards and Aliquot Parts.
1, GEORGE BOUSFIELD of No. 3 Sylvan Crescent Hainton Street, Great Grimsby,
Commercial Traveller in the Timber Trade 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 rule has been constructed with a view primarily to simplify the measuring of
round square and unsquared timber which necessarily forms a considerable part of a
timber buyer's business, but at the same time is capable of an exhaustless variety
of uses, in the computation of all the various and abstruse calculations found not only
in the Timber, but all other kindred trades, such as brick, stone glass &c.
Figure 1 of the accompanying drawings shows one side or face of a rule constructed
according to my invention, figure 2 shows the opposite side of the rule and Figure 3
is a view of one edge of the rule.
The frame of the rule is 12 inches long and marked on one edge in inches and parts
as shown in Figure 3 and on the other bevelled edge is contained a 316 scale as
shown on the left of Figure 1 and the slide or middle part S is about 13 inches long
12 of which only need be divided in order that when the same is drawn out to the
extent of its divided part the rule will measure just 2 feet and can be used in the same
way as an ordinary two foot rule, being marked on one edge and down the centre on
one side as shown at Figure 1 for this purpose.
On one side the divisions are arranged decimally and on the other duodecimally
that is to say, one side is divided into feet inches and parts whilst the other is divided
into feet and decimal parts of a foot or units tens and hundreds. The face of the
decimal side comprises six scales indicated by the letters L D CM BA. Reckoning
from the right hand side the second third and fifth scales viz.: B M and D consist of
two radii each, whilst the sixth or girth line L is a single radius, extending from
4 to 40.
The numbers advance in a tenfold proportion in each radius according to the value
you place upon the first.
Thus if the first 1 represents one tenth the middle 10 will represent 1 and the
end 100 will represent 10 or if the first 1 represents unit the middle 10 will be 10 and
the end 100 and so on, the intermediate divisions following in like proportion.
The decimal side is constructed on the same principle as the ordinary brass slide in
a carpenters slide rule, with the exception that the ordinary brass slide is work
horizontally and my slide is moved vertically the numerals being placed accordingly
as shewn and the figures being large are thus far more discernible, so that whatever
the ordinary brass slide is capable of the same can be effected and with greater ease
and accuracy by the side of mine alone.
The duodecimal side Figure 2 comprises 7 scales or radii. The outer left and right

page_text: hand scales marked E and K respectively are decimally arranged for use when
deciphering decimal parts of a multiple number. The second on the left marked F is
a duodecimal scale ranging from 100 to 1.
The duodecimal scale on the two outer edges of the slide S correspond to each other
and range from 5 inches to 80 feet.
The scale J on the frame opposite to the right of the slide, S is a duodecimal scale
ranging from 1½ inches to 150 feet.
•
The central scale H on the slide S contains standard quantities that is to say a
graduated scale on the logarithmic principal ranging from 3 parts or (18 f. 3 × 11 in.)
to 5 standards.
This scale is so constructed that the standard quantities indicated increase or
decrease on the logarithmic principle in the same way as by the same rule the opposite
scales on the frame (in the well known manner) increase and diminish respectively.
It will thus be seen that in this my invention I have combined in one instrument a
scale for taking off quantities from plans, a decimal slide capable of working all the
various problems now obtained by the brass slide, also the duodecimal scale for cubing
round, square and unsquared timber or scantling, and lastly a graduated scale of
Standard measurements by which a comparison between lineal superficial and cubic
feet of any size and the relative St. Petersburg Standard measurement can be seen
without calculation besides the advantage of an ordinary two foot rule which
combination has not been attempted before.
Having now particularly described and ascertained the nature of my said invention
and in what manner the same is to be performed I declare that what I claim is:-
First In a slide rule the combination of a scale for taking off quantities from
plans a decimal slide for solving the various problems now obtained by the ordinary
brass slide in slide rules, a duodecimal scale for cubing round square and unsquared
timber or scantling, and a graduated scale of standard measurement for shewing
without calculation a comparison between lineal superficial and cubic feet of any size
and the relative St. Petersburg Standard measurement, the instrument also serving
the purpose of an ordinary two foot rule substantially as set forth.
Second-The construction of slide rule shewn on the drawing.
Dated this 8th day of July 1887.
GEORGE BOUSFIELD,
By Jensen & Son,
77, Chancery Lane, London, W.C.
Patent Agents.