Figure 1-1. Typical binocular microscope.
c. Illumination. Correct illumination can be obtained from reflected
(mirror) or direct (under the stage) light. The size of the opening of the condenser (iris
diaphragm) and the position (high or low) control the amount of light entering the
system. As the condenser is lowered, less light arrives at the ocular. When using a
mirror, the flat surface should be employed for artificial light, whereas the concave side
of the mirror is utilized in order to concentrate the scattered rays of natural light. Kohler
developed a type of illumination (which bears his name) that achieves an even and
optimum light irrespective of the light source. This type of critical illumination should be
established prior to use of the microscope.
1-25. CARE OF THE MICROSCOPE
The microscope is a delicate precision instrument. Therefore, it must be handled
with the utmost care.
1-26. USE OF THE MICROSCOPE
a. Use. Unauthorized persons should not be allowed to manipulate the
microscope. Authorized personnel should receive training on microscope use on an as