Improvements in Slide Rules
Year: 1890

page_text: Date of Application, 27th Mar., 1890
Complete Specification Left, 29th Dec., 1890-Accepted, 28th Mar., 1891
PROVISIONAL SPECIFICATION.
Improvements in Slide Rules,
ARTHUR HONEYSETT, 1129, Calle Piedad, Buenos Aires, Surveyor, and
WILLIAM FORD STANLEY, 4 and 5, Great Turnstile, Holborn, London,
Mathematical Instrument Maker, do hereby declare the nature of this invention
to be as follows :-
The object of this invention is to construct a special form of slide rule as
hereinafter described for performing the calculation of velocities, and discharge of
pipes, and conduits according to any approved formula.
The rule may be made of metal, wood, or any other suitable substance, and
carries on its surface a set of logarithmic scales which may be called for
reference, a, b, c, d, e, f, g, & h; two of these scales are on a slide suitably
arranged as in ordinary slide rules, a, being the scale above the slide b, and,
respectively, the upper, and lower scale on the slide, d, e, f, g, & h, respectively
below the slide. Scale a, is divided to give the square root of the fifth powers
of the values on scale, which is divided for the areas; scale c, is divided for
inclination; scale d, for velocities, and e, i, u, & h correspond to the 1st 2nd 3rd
& 4th classes respectively of the coefficients, according to the nature of the channel,
and are divided to the value of the hydraulic mean depth. Above the surface of
these scales running the whole length of the scale at the top, and bottom are
grooves constructed to carry a transparent sliding piece, or rider with one, two, or
more vertical lines upon it so that it can be moved over the scales normal to any
desired position; this part of this invention may be applied to any slide rule; a
table is attached to the back of the rule to facilitate the calculation of the area,
and hydraulic mean depth of segments of circular, oval, and other conduits, and
pipes, giving guage points, etc. which correspond in position to logarithms upon the
rule. Various modifications may be made by additions to, or reduction from the
number of scales employed for hydraulic coefficients according to the calculations
required to be performed, always preserving the essential features of this invention
which is a suitably constructed slide rule for hydraulic calculations embracing also
a special slide arrangement of rider thereto.
Dated this 27th day of March 1890.
H. T. TALLOCK,
28, Hatton Garden, London, E.C., Agent for Applicants.
COMPLETE SPECIFICATION.
Improvements in Slide Rules.
ARTHUR HONEYSETT, of 1129, Calle Piedad, Buenos Aires, Surveyor, and
WILLIAM FORD STANLEY, of 4 and 5, Great Turnstile, Mathematical
Instrument Maker, do hereby declare the nature of this invention, and in what
manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
The object of this invention is to construct a special form of slide rule as
hereinafter described, for performing the calculation of velocities, and discharge of
pipes and conduits according to any approved formula.
The rule may be made of metal wood or any other suitable substance and
carries on its surface a set of logarithmic scales which may be called for
reference, a, b, c, d, e, f, g and h, two of these scales are on a slide suitably
arranged, as in ordinary slide rules, a, being the scale above the slide, b, & c

page_text: respectively, the upper and lower scale on the slide d, e, f, g&h respectively
below the slide. Scale a is divided to give the square root of the fifth powers of
the values on scale b, which is divided for the areas, scale e is divided for inclina-
tion, scale d, for velocities and e, f,y and h, correspond to the 1st, 2nd, 3rd
& 4th classes respectively of the coefficients, according to the nature of the channel,
and are divided to the value of the hydraulic. mean depth. Above the surface of
the scales, running the whole length of the scale at the top and bottom, are
grooves constructed to carry a transparent sliding piece or rider with one two or
more vertical lines upon it, so that it can be moved over the scales normal to any
desired position. This part of the invention may be applied to any slide rule. A
table is attached to the back of the rule to facilitate the calculation of the area,
and hydraulic mean depth of segments of circular, oval, and other conduits and
pipes giving gauge points, &c., which correspond in position to logarithms upon the
rule. Various modifications may be made, by additions to or reductions from the
number of scales employed for hydraulic coefficients, according to the calculations
required to be performed, always preserving the essential features of this invention
which is a suitably constructed slide rule for hydraulic calculations, embracing also
a special slide arrangement of rider thereto.
In the accompanying drawings,
Sheets 1, 2 and 3 represent an enlarged front view.
Fig. 1, the scale, being divided into three pieces indicated by the dotted lines.
A. A. A is the body, B. B. B. the slide, and C Sheet 2 the transparent rider
sliding over all the scales.
Sheets 4, 5, and 6 represent an enlarged back view, Fig. 2, shewing the tables
divided into three pieces indicated by the dotted lines.
Fig. 3, Sheet 2, is an end view, similar letters denote similar parts. D. D. are
grooves for rider to run in.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. The hydraulic slide rule as herein described and illustrated.
2. The use in combination with slide rules of a transparent rider as described
traversing the scales on the rule, guided by suitable grooves.
Dated this 27th day of December 1890.
H. T. TALLOCK,
28, Hatton Garden, London, E.C., Agent for Applicants.