Improvements in and connected with Refractionists Rules for Measuring Spectacle Frames
Year: 1899

page_text: Date of Application, 13th Feb., 1899
Complete Specification Left, 13th Nov., 1899-Accepted, 16th Dec., 1899
Improvements in and connected with Refractionists Rules for
Measuring Spectacle Frames,
I, HENRY WILLIAM FREEMAN, of S, Hamilton Parade, Sidcup, in the County
of Kent, Opthalmic Optician and Jeweller, do hereby declare the nature of this
invention to be as follows:-
The object of this invention is to so construct refractionists rules on attach-
ments therefor as to enable the sand rules to be used for measuring the distance
trom centre to centre of the lenses, the depth of the bridge and the set of the
bridge whether In or out."
"
Now according to this invention attach to the zero end of the rule a
T shaped piece of metal or other suitable material having metric graduations
on the stem of the T which graduations are continued a suitable distance on
the rule itself.
The top of the T projects at one or both ends beyond the edge of the rule
and in all cases beyond the graduated edge thereof.
I may also form metire graduations on the rule at about the centre thereof
such graduations being at right angles to the length of the rule.
The ordinary graduations enable the distance from centre to centre of lenses
to be measured by placing the outside of the frame against the projecting por-
tion of the T shaped piece at the zero end of the rule and reading the distance
in millimetres to the portion of the frame next the bridge
"
The set of the budge 11 or out" is measured by placing the inside of the
frame against the Ț piece and the height of the bridge is measured by the
cross scale.
IXA
1111 ,
2
1000
T. E. HALFORD,
11, Furnival Street, Holborn, London,
Agent for Applicant.
Improvements in and connected with Refractionists Rules for
Measuring Spectacle Frames.
I, HENRY WILLIAM VRLEMAN, of S. Hamilton Parade, Sidcup, in the County
of Kent, Opthalmic Optician and Jeweller, do hereby declare the nature of this
invention and in what manner the same is to be performed, to be particularly
described and ascertamed in and by the following statement :-
-
The object of this invention is to so construct refractionists rules or attach-

page_text: ments therefor as to enable the said rules to be used for measuring the distance
from centic to centre of the lenses, the depth of the bridge and the set of the
bridge 111 or "out taking the inner plane for the zero or level position
.
Now according to this invention 1 attach to the zero end of the Lule a
Tshaped piece of metal or other suitable material having metric o inch gradua-
tions on the stem of the T which graduations are continued a suitable distance
on the rule itself
The top of the T projects at one or both ends beyond the edge of the rule
and in all cases beyond the graduated edge thereof
I may also form metric or inch graduations on the rule at about the centie
thereof such graduations being at night angles to the length of the rule.
The ordinary graduations enable the distance from centre to centre of lenses
to be measured by placing the outside of the frame against the projecting poi-
tion of the T shaped piece at the zero end of the rule and reading the distance
in millimetres or inches and fractions of an inch to the portion of the frame
next the bridge.
"
The set of the budge "in" or out is measured by placing the inside of the
frame against the T piece and the height of the bridge is measured by the
cross scale.
And in order that my said invention may be fully understood I will proceed
to explain the same with reference to the accompanying drawings in which
Fig 1 represents obverse side of a refractionists iule constructed according
to this invention
Fig. 2 is edge view of same
Fig. is view of a portion of the reverse side of same.
The same letters denote the same parts in all the figs.
:
(b is the ule of boxwood ebony ivory celluloid or of any other suitable
material graduated in millimetres (or inches and fractions of inches) as shewn
at Fig 1.
:
The rule also has a line f marked along the centre of the same and a line y
at right angles to the line f.
Metric or other graduations are marked along the line g.
At the left hand or zero end of the rule a is a T shaped piece of metal or
other suitable material & the ends of which di du project beyond the edges of
the rule a
The stem e of the T shaped piece lies below the obverse face of the rule
and is also graduated in millimetres or other suitable divisions which gradua-
tions are also continued on the obverse face of the rule as shewn
On the reverse side of the rule I may mark a protractor which when placed
in front of a cylindrical lens having the axis mai ked thereon gives the angle
(for ght or left eye) m standard notation.
I also may give on the reverse side of the rule the sizes of standard calibres
for lenses from 0 0 to 3 with the exact geometucal centre of each calibie
marked The rule is used as follows
To find the distance from centre to centre of the lenses in a spectacle frame
place the joint end of the right eye of the frame against the projecting poi-
tion of the piece d and read the distance from zero to the bridge end of the
left eve of the frame This distance is the measure of the distance apart ot
the centres of the lenses.
To measure the height of the bridge place the centies of the frame joints
on the line and note height of bridge above or below this line on scale c.
To measure set of bridge in or out turn the frame upside down with the top
of bridge resting on the projection e and the piece d bearing on the inside of
the lenses the set 111 or out is then read off on the scale h.
"
"
',
All scales most frequently in use are numbered every second graduation thus
saving time in noting the reading.

page_text: 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—
1. In a rule for measuring spectacle frames the construction and use of a
Tshaped piece of metal or other suitable material d projecting at and
beyond the edges of the rule having the portion sunk below the obverse face
of the rule and provided with a graduated scale substantially as and for the
purposes stated
2. In a rule for measuring spectacle frames the combination with a rule a
having metric or other graduations thereon, of a line f, a line g at right
angles thereto, graduations on the line and a piece
9
having projecting
portions and graduations on the portion e of the piece d and on the
rule all substantially as here before specified and for the purposes stated.
3. Rules for measuring spectacle frames constructed as shewn by the accom-
panying drawings
IL 41;. 1141,
1900
TE. HALFORD,
82, Mark Lane, London, EC., Agent for Applicant.
TE. HALFORD,
82, Mark Lane, London, EC.. Agent for Applicant.