VIEWER OPERATION

About Blister Microscope

Because of its wide field, relatively low power (50X) and built-in light, even pre-schoolers quickly learn how to operate the Viewer. If the object to be viewed is placed in the center of the opening under the tube, it should be near the center of the field of view. The knobs are then turned to raise or lower the tube which brings the object into focus.

Light passes from the bulb down through the filter onto the first mirror and is reflected
up through the opening directly under the tube.
Some materials show up better if the light from
below is reduced or shut out entirely. To accomplish this, simply place a square about an inch on each side from a piece of construction paper or pasteboard. Slip this square over the filter. If the filter is completely covered, all light from below is shut out. If the filter is partly covered, the field is only partly darkened.

Since the light bulb is positioned close to the tube, much light falls on the upper surface of the object. This light from above, coupled with the lower magnification, makes it possible to view opaque objects such as small rocks, coins, paper, cloth, insects, etc., which cannot be viewed with a conventional microscope or microprojector.