94  £. Cutter—Microphotography with Tolles’s Objective. 
space of time. 2. The work must be done at different locali- 
ties so as to have plenty of material to select from and to 
avoid disturbing elements. From these considerations it is 
easy to see that the Woodward plan of a dark chamber large 
enough to hold the operators and assistants could not be 
adopted, as it could not be carried about. 
igure 1, is a drawing of my best apparatus, Scale 1,5 
inch to one foot; the base is a black walnut 14 inch thick 
been removed also. The camera is set up on a box in order to 
get the requisite height to bring the axis on a line with that of the 
microscope. The camera moves on the box and the box moves 
on the base. The three are connected as follows: a groove 
inch wide and ? inch deep is cut in the base exactly in the 
median line and at right angles to the length. This is filled 
by a piece of ebony 4 inch to 4 inch thick and 4 or more 
inches long. A brass plate is let into the ebony so that when 
it is secured by screws it forms the bar of the inverted + 
before alluded to. When in situ this T slides under the 
base board brass strips. This arrangement is good but dont 
stand travel by railroad. The same arrangement connects the 
mirror to the b , 
' By the side of the camera is a rod 26 by # inches. Two 
screw eyes are let into the base board just at the ends of the 
rod. A screw runs through the eye into the right end of the 
a 
