AN IMPROVED LAMP OR APPARATUS FOR SHADING THE ELECTRIC AND OTHER LIGHTS, AND FOR PRODUCING VARIOUS EFFECTS OF LIGHT FOR SCENIC AND OTHER PURPOSES
Year: 1879

page_text: LETTERS PATENT to Tom Walford Grieve, of Macklin Street, Drury Lane, in
the County of Middlesex, Artist, for the Invention of "AN IMPROVED LAMP
OR APPARATUS FOR SHADING THE ELECTRIC AND OTHER LIGHTS, AND FOR
PRODUCING VARIOUS EFFECTS OF LIGHT FOR SCENIC AND OTHER PURPOSES."
Sealed the 11th July 1879, and dated the 22nd January 1879.
PROVISIONAL SPECIFICATION left by the said Tom Walford Grieve at the
Office of the Commissioners of Patents on the 22nd January 1879.
TOM WALFORD GRIEVE, of Macklin Stroet, Drury Lane, in the County of Mid-
dlesex, Artist. "AN IMPROVED LAMP OR APPARATUS FOR SHADING THE ELECTRIC
AND OTHER LIGHTS, AND FOR PRODUCING VARIOUS EFFECTS OF LIGHT FOR SCENIC
AND OTHER PURPOSES."
My Invention relates to an apparatus arranged to hold any desired number of
glasses, colored or partially opaque, or shades wholly opaque, in such a manner that
they may be raised or lowered in any desired order with great facility, so as to
enclose or shade, partially or on all sides, an electric or other light suspended from
the ceiling of the auditorium of a theatre or of any public building, or above or in
any part of the stage, in any apartment, or outside of a building.
In lieu of glass I may use silk or other textile fabric secured to a frame, or
gelatine, or any material which I may find suitable for shading the light and giving
me the tint I may require.
The construction and working of my improved lamp or apparatus will be readily
understood by reference to the accompanying Sheet of Drawing, upon which,-
Figure 1 represents an elevation of a lamp or apparatus embodying my
Invention.
Figure 2 is a section through the box or chamber for the glasses or shades, which
are here shewn drawn up within the chamber.
Figure 3 is also a section, but with the outer glass or shado (say, the red) lowered
so as to screen the light, and cause it to give the required effect upon the apartment
or scene

page_text: Figure 4 is a similar view, but shewing the inner glass or shade (say, the green)
lowered over the light, and
Figure 5 is a sectional plan through the box and glasses or shades.
A indicates the electric or other light.
B, box or chamber above for holding glasses or shades.
C, outer glass or shade, red or other color.
D, inner glass or shade, green or other color.
E, chain or cord for raising glass or shade C.
F, chain or cord for raising glass or shade D.
G, G, fillets secured upon the outer shade C by which it is hung when in use.
H, H, tubes screwed to top of apparatus, and partially closed at lower ends.
I, I, rods sliding within the same, which actuate the closing of the lower portion
of glass or shade C; these rods have upon the upper end a burr or collar i.
K, K, suspension rods for inner shade or glass D, also having a burr or collar k at
lower end.
L, L, bell mouthed tubes secured to glass or shade D, and arranged to slide upon
the rods K, K, being partially closed at their upper ends.
The apparatus may be fixed to the ceiling or in any convenient position.
In order to lower the glass or shade C (red) the cord or chain E is released.
During the descent of the glass or shade the rods I, I, which lower with it, are
arrested by the burrs or collars i, i, coming in contact with the lower ends of the
tubes H, H, thereby causing the hinged bottom of the shade to be drawn up, as
shown in Fig. 3.
The glass or shade C being at the time arrested by the fillets G, G, bearing upon
the inner portion of the box B.
To lower the glass or shade D the cord F is released. In this case the glass or
shade descends, and with it the two tubes L, L, until it is arrested by the burrs or
collars k, k, upon the rods K, K; at the samo time a similar arrangement to that
above described in relation to glass or shade C closes the lower portion of the glass
or shade D, but is not shown on the Drawing, excepting upon the plan, Fig. 5.
I need scarcely observe that the glasses or shades are returned to the box by
simply pulling upon the cords or chains by which they were lowered.
I do not limit myself to an arrangement of only two glasses or shades, but may
use any desired number, and raise or lower them together, alternately, or in any
order, and even in parts, so as not shade the light on all sides, according to the effect
which I desire to produce; noither do I confine myself to the square form of appa-
ratus as shown in the Drawing.

page_text: effect which I desire to produce; neither do I confine myself to the square form of
apparatus, as shewn on the Drawing, nor to the particular devices I have described
and shewn for operating the upward movement of the bottom portion of the
glasses or shades when these latter are lowered, as such might be varied, and the
lamp or apparatus retain the characteristic features of my Invention, and that
what,
I claim as secured to me by the hereinbefore in part recited Letters Patent is,-
Firstly. The use of glasses or shades of various colours and of any suitable
material, when combined in a box or chamber, and operated therefrom to shade
an electric or other light, substantially as and for the purposes hereinbefore
described.
Secondly. The use of glasses or shades with the lower part hinged or moveable,
so that it may be drawn up or closed under the light when the glass or shade
is lowered from its box or chamber, substantially as and for the purpose hereinbefore
specified.
In witness whereof, I, the said Tom Walford Grieve, have hereunto set my
hand and seal, this Eighteenth day of July, in the year of our Lord One
thousand night