12 
PRACTICAL PHOTO-MICROGRAPHY. 
wooden sink lined with medium-thick sheet lead, as less 
likely to get broken, and to break measures or dishes 
which might fall on it. The tap should have a “ rose ” 
at the delivery end, and in the sink should be a grating, 
or “ hatch,” whereon measures, dishes, etc., may 
drip. 
All the appliances in the way of dishes, measures, and 
the like, needed for quarter-plate negatives, or half-plate 
if the worker be ambitious, may be obtained for a few 
shillings. 
The most important point to be considered in 
choosing the room for the microscopic part of the 
work is that oi freedom from tremor under all conditions. 
A basement, or half-basement, apartment is suitable, 
provided we have means of keeping it dry. But an 
ordinary room with a good floor will answer well, 
especially if we do not propose to do very high power 
work. But if our work is, to a great extent, to be high 
power, then we shall do well to secure a thoroughly 
steady apartment from the first. 
In such an apartment we must have a strong, solid, 
steady table to support our apparatus. If we are 
unable to secure a room above suspicion of tremor, we 
must fall back on a device for ensuring synchronous 
vibration of all the elements of our photo-micrographic 
apparatus. As will be seen, the various parts of our 
apparatus proper are mounted on one strong base, and 
we nray place beneath such base cubes of guttapercha, 
or even layers of carpet, so that any tremor may affect 
the entire apparatus simultaneously, the damage of 
