A Reflecting and Ventilating Device or Apparatus for Photographic Exposure by the Magnesium Light.
Year: 1893

page_text: Date of Application, 14th Nov., 1893
Complete Specification Left, 11th Sept., 1894-Accepted, 13th Oct., 1894
PROVISIONAL SPECIFICATION.
A Reflecting and Ventilating Device or Apparatus for Photographic
Exposure by the Magnesium Light.
I, WALLACE FAIRWEATHER, C.E., of 62 Saint Vincent Street in the
City of Glasgow, Chartered Patent Agent, do hereby declare the nature of
this invention (as communicated to me by Josef Köst of Blucherstrasse 19
Frankfurt on the Main in the Empire of Germany Photographer) to be as
follows:-
This invention has for its object to facilitate and to perfect the taking of
photographic views by the use of the magnesium light and is carried out in the
following manner :
1. By the use of oblique reflecting walls in proximity to which the magnesium
lamps are applied and fixed and which allow the object to be placed in the best
possible light.
2. By the conveyance of the vapors arising from the combustion of the magnesium
into the atmosphere without these vapors being allowed to become in the least
injurious to the operator.
The device consists firstly of a shell or casing made preferably of sheet metal
and which is placed in a room against the open window so as to entirely cover
the latter.
The casing has no wall against the window but is entirely open and it likewise
requires no bottom being tapered towards the back and along the sides while an
opening is formed at the rear for a door through which is inserted a second casing
open at this end consisting of unpolished or dull glass or of thin white material and
the front end wall or background of which faces the window and is made of wood
or sheet metal.
In this casing the exposure takes place the objects being placed in front of
the fixed front wall while the photographs are taken at the open end or inlet. The
tapering of the case has such an effect that the magnesium light applied to its
inner walls in suitable positions can be concentrated upon the object through the
dull glass or the white material of the casing and in order to reflect the light in as
intense a manner as possible the walls of the casing are painted white.
The tapering will have further for its effect to readily convey the magnesium
vapors through the window into the atmosphere and owing to the space between
the two casings being closed off from the inside of the room the operator or persons
taking part in the operation will be in no wise injured by the vapors from the
magnesium.
Dated this 13th day of November 1893.
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.

page_text: A Reflecting and Ventilating Device or Apparatus for Photographic
Exposure by the Magnesium Light.
I, WALLACE FAIRWEATHER, C.E., of 62 Saint Vincent Street, in the City of
Glasgow, Chartered Patent Agent, do hereby declare the nature of this invention
and in what manner the same is to be performed, as communicated to me, to be
particularly described and ascertained in and by the following statement :-
This invention has for its object to facilitate and to perfect the taking of
photographic views by the use of the magnesium light, and is carried out in the
following manner: 1. By the use of oblique reflecting walls in proximity to which
the inagnesium lamps are applied and fixed and which allow the object to be placed
in the best possible light. 2. By the conveyance of the vapors arising from the
combustion of the magnesium into the atmosphere, without these vapors being
allowed to become in the least injurious to the operator.
As shewn by the accompanying drawings Figure 1 being a longitudinal vertical
section and Figure 2 a horizontal section the device consists firstly of a hollow
shell or casing a made preferably of sheet metal and having the form of a truncated
pyramid open at both ends the base of which is placed airtight against the open
window of a room so as to entirely cover the former, whilst the smaller end c
remains open. Against the opening c is placed the open end of a similarly shaped
casing composed of unpolished or dull glass or of thin white material the
rear wall or background e which faces the window d being made of wood or
sheet metal.
In this casing the exposure takes place, the objects being placed in front of the
fixed rear walle while the photographs are taken at the open end or inlet c. The
tapering of the case a has such an effect that the magnesium light applied to its
inner walls in suitable positions can be concentrated upon the object through the
dull glass or the white material of the casing b, and in order to reflect the light in
as intense a manner as possible the walls of the casing a are painted white.
Owing to the pyramidal form of the casings a, b, the escape of the magnesium
vapors through the window into the atmosphere will be promoted, and owing to
the space between the two casings being closed off from the inside of the room
the operator or persons taking part in the operation will be in no wise injured by
the vapors from the magnesium.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, as communicated to me,
I declare that what I claim is :-
A reflecting and ventilating device for taking photographic views by magnesium
light consisting of an outer casing a communicating with the outside air and
provided with walls tapering rearwardly and to which the magnesium lamps or
light are or is applied, and a second or inner casing 6 made at the top and on both
sides of unpolished glass or other thin material, the vapors arising from the
magnesium escaping from the space between the two casings into the atmosphere,
substantially as described.
Dated this 10th day of September 1894.
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.