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PACIFIC SCIENCE, Vol. XVII, July 1963 
Figure 2 A, are drilled through the sheet alumi- 
num which forms the floor of the cart. A 44 X 
44-inch slit is cut at A and a round 44-inch 
hole at B, as shown in the same figure. Slit A 
is used to adjust and fix the substage illumi- 
nator in place, and B is for the microscope set 
screw, the same screw which came with the 
microscope for fastening it to the bottom of 
the microscope case during shipment. Two 5- 
inch sections of angle aluminum are cut, and 
two 5/32-inch holes drilled on each limb of 
the right angle. Each hole is 44 inch from the 
end of the aluminum section. One of these two 
sections is mounted on the front undersurface 
of the floor of the cart with two 3/32 machine 
screws and nuts, and the other section similarly 
mounted on the right undersurface at right 
angles to the first (Fig. 2 B at 4). A third 
piece of angle aluminum, 144-inch long is cut 
A. B. 
Fig. 2. Diagrams showing microscope carrying cart 
floor and top view of stand in use. A, Top surface of 
cart floor, showing openings 1 to 6 for attaching angle 
aluminum on undersurface; A, slit for adjusting and 
fixing illuminator; B, opening for microscope base set 
screw. Broken line indicates outline of the base of the 
microscope. B, Undersurface of cart floor. 1—3, sheaves; 
4, 5 -inch angle aluminum for buffering against spacer. 
C, Right portion of plate-glass toppiece of stand show- 
ing culture slides, 1-6 in place. Stippled areas repre- 
sent masking tape. Other slides and glass (or metal) 
are positioning guides. 
and a 5/32-inch hole drilled at a distance of 
44 inch from each end. It is mounted along 
the back border on the undersurface of the cart 
floor with metal screws and nuts through open- 
ings 3 and 4 (see Figs. 2 A, 2 B). Three alumi- 
num sheaves (1, 2, 3 in Fig. 2 B) are mounted 
with machine screws and nuts on the vertical 
limb of the angle aluminum pieces on the 
undersurface of the cart floor so that sheaves 
No. 1 and 2 are 444 inches apart and each 44 
inch from the end of the 5 -inch section of angle 
aluminum. Sheave No. 3 is mounted on the 
center of the vertical limbs of the 144 -inch 
section of angle aluminum and at a distance 
544 inches from a line joining sheaves No. 1 
and 2. When the cart is placed on the platform 
the sheaves should ride smoothly but snugly 
on the track. (3) The spacers are six 5 3/ 16- 
inch sections cut from the 1-inch extruded rec- 
tangular aluminum channel. One spacer is 
mounted on the right-hand end of the plat- 
form with No. 8 wood screws, after the proper 
holes are drilled, to serve as the starting or 
ending point in the side to side movement of 
the microscope-carrying cart. 
OPERATION OF INSTRUMENT 
To employ this instrument for taking photo- 
micrographs a microscope and a substage il- 
luminator are mounted on the microscope-carry- 
ing cart. In our laboratory an old E. Leitz 
Wetzler microscope with its mirror removed 
is fastened on the car r floor by its set screw 
driven through opening B into the horse-shoe 
shaped base, and a Kohler illuminator through 
slit A. The light is centered and adjusted by 
standard procedures (Gray, 1958). The stand 
is placed on the laboratory table with its length 
parallel with the edge of the table and the 
slanting edges of the aluminum end supports 
near the operator. The platform is placed inside 
the stand so that a 44 -inch clearing is produced 
on all four sides between the platform and the 
base of the stand. The microscope with its cart 
and illuminator is carefully put in place by 
sliding the microscope stage immediately under 
the plate-glass toppiece of the stand from back 
forward across the stand until the sheaves are 
over the track. The cart is lowered onto the 
track and pushed toward the right until it is 
