Improvements in Registering Apparatus for Photographic Exposures.
Year: 1890

page_text: Date of Application, 3rd May, 1890
Complete Specification Left, 3rd Feb., 1891-Accepted, 28th Mar., 1891
PROVISIONAL SPECIFICATION.
Improvements in Registering Apparatus for Photographic Exposures.
JOSEPH PARKINSON, South Regent Street, Lancaster, Electrician, SAMUEL
FAWCETT, Elm House, Meeting House Lane, Lancaster, Photo-engraver, and
CHARLES FREDERICK PARKINSON, South Regent Street, Lancaster, Engineer,
do hereby declare the nature of this invention to be as follows:-
"Roll
Our invention, which is particularly applicable to "Roller Slides" or
Holders "-containing a flexible support for the sensitive coating, consists of
using a pinion having only one tooth, gearing into a wheel-which we call a
registering wheel-having teeth equal in number, or any proportion of that number,
to the maximum number of exposures the "Roller Slide," or "Roll Holder," will
contain. Or, we use a pinion having one more, or one less tooth than a multiple of
the teeth of the registering wheel.
On the face of the registering wheel, are numbers to indicate the number of
exposures made. Or, we use in place of the registering wheel, an endless chain or
band, having links or projections corresponding in number, or a proportion of that
mumber, to the teeth of the above mentioned registering wheel. On the face of the
chain, band or registering wheel, the numbers may be arranged as to indicate the
number of exposures that have been made; or, they may be so arranged as to
iudicate, the number of exposures remaining. The invention is applied as follows:-
Where the measuring roller is equal in circumference to the length of film required
for one exposure, the single toothed pinion is fixed to the spindle of the measuring
roller; and the registering wheel rotates on an independent stud. The teeth of the
registering wheel, and the tooth of the pinion, are so adjusted in relation to each
other, that, for every revolution of the single toothed pinion, the registering wheel
moves a distance equal to a gap between any two of its teeth; a brake may be used
to prevent its being moved more than that distance except when actuated by
the single toothed pinion. If, instead of using the single toothed pinion, we use the
one, having a tooth more, or a tooth less than a multiple of the teeth of the
registering wheel, the numbers on the registering wheel will not be consecutive,
but will step" a distance equal to the number of teeth in the pinion.
6i
In cases where the measuring roller is less in circumnference than a length of film
required for one exposure, the pinion is fixed to a wheel, which, being geared to a
pinion on the measuring roller, rotates once for a length of film required for one
exposure.
When using the chain or band, the gearing as before, is so arranged, that for
every revolution of the pinion, which actuates the registering wheel, chain or band,
the registering wheel, chain or band will indicate that another exposure has been
made.
In cases where it is necessary, we make use of an annular registering wheel.

page_text: COMPLETE SPECIFICATION.
Improvements in Registering Apparatus for Photographic Exposures.
JOSEPH PARKINSON, Electrician, South Regent Street, Lancaster, SAMUEL
FAWCETT, Photo-engraver, Elm House, Meeting House Lane, Lancaster,
CHARLES FREDERICK PARKINSON, Engineer, South Regent Street, Lancaster,
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:-
Our invention, which is particularly applicable to "Roller Slides" or "Roll
Holders containing a flexible support for the sensitive film or coating-consists
of a pinion and registering wheel or wheel. The pinion A is fixed to, and rotates
with the measuring roller (and when the measuring roller is equal in circum-
ference to the length of film required for an exposure, may have a single tooth only
Fig. 1; in which case, the registering wheel B-when only one is used will have
teeth equal in number to the immber of exposures the "Roll Holler" or *Roller
Slide will contain.
The action is as follows:-On a length of film being unwound, the pinion A-
when the measuring roller is equal in circumference to the length of film required
for an exposure-rotates once and moves the registering whel Bone tooth
forward; and the numbers being consecutive, it will indicate the number of
exposures made.
In case we use more than one registering wheel Fig. 2; the first is geared as
before to the single toothed pinion A, and has ten teeth with the numbers 1. 2.
3. 4. 5. 6. 7. 8. 9. 0 around the face of the wheel; the next D has the same
number of teeth and is similarly numbered and arranged so that, one complete
revolution of the first registering wheel moves the second wheel one tooth forward
and that in turn may be arranged to move, on completing one revolution, a
thin wheel E one tooth forward. The mumber of exposures that could be indi-
ented by using three registering wheels would be from one, to nine hundred and
ninety nine.
Instead of the single toothed pinion A, one may be used having one more, or
one less than a multiple of the teeth on the registering wheel Fig. 3; that is,
where snly one registering wheel is used. The numbers on the registering
wheel B when using such a pinion, would not be consecutive but would step
the same number of teeth there are on the pinion, see Fig. 3.
As an illustration, we will suppose the pinion to have three teeth and the
registering wheel ten the numbers on the face of the registering wheel would
be in the following order :-1. 8. 3. 2. 9. G. 3. 10. 7. 4. Starting at No. 1 the
pinion A on making one revolution, moves the registering wheel B three teeth
and No. 2 comes into position and so on until all the exposures are made.
In all the foregoing cases, the measuring roller C is equal in circunference to a
length of film required for an exposure.
In case the measuring roller has to make more than one revolution to unwind
the length of film required, then the number of times it has to rotate multiplied by
the mumber of teeth on its pinion A, would decide how many teeth on the register-
ing wheel B, the indicating numbers would have to step." Returning to our
simple illustration, but substituting 11 teeth instead of the 10 on the registering
wheel, and presuming the measuring roller to make two revolutions to measure the
length of film required for an exposure, the indicating numbers would then be
placed in the following order :—1. 3 5. 7. 9. 11. 2. 4. 6. 8. 10.
Having now described our said invention, we would observe in conclusion that
what we claim is :-
Firstly. The application of a pinion in connection with a measuring roller for
photographic exposures

page_text: Secondly. The use of a registering wheel or wheels in conjunction with the
aforesaid pinion.
Thirdly. The apparatus substantially as set forth and herein described.
In witness whereof we have hereunto set our hands this Second day of February
in the year of our Lord One thousand eight hundred and ninety-one.
Did thin and dave of Fahrua 1801
JOSEPH PARKINSON.
SAMUEL FAWCETT.
CHARLES FREDERICK PARKINSON.