93 
By a very simple light excluding sleeve and by the camera being movable 
the connection of the two parts is readily effected in such a manner as to exclude 
the admission of external light. 
iff M'WiWEHiJiNA 
Fig*. 47. Large Photo-inicrographic and Projection Apparatus. 
A wood base 60X125 cm (24"X50"), supported by two cast-iron standards 
is fitted at one end with an adjustable base-plate upon which the m i c r o s c o p e 
is to be placed; the middle portion of the wood base is occupied by a horizontal 
guide-bar of 60 cm (24") length while the other end of the base is left entirely 
free in order to provide room for the various sources of illumination. 
The principle feature of the design of this apparatus consists in arranging 
the support of the microscope and its appendages in such a manner that they 
are or may be once for all accurately centered, subsequent adjustment being 
only necessary for the source of illumination ; here adjustability is imperative for 
obvious reasons. 
In all cases where the appliances forming part of the apparatus are supplied 
by us simultaneously, no adjustments beyond those effected by us and that of the 
source of illumination will be needed. The apparatus when once properly adjusted 
is not subject to decentration. 
A more detailed description of the arrangement of the apparatus together 
with short instructions will shortly follow in a separate pamphlet. 
