All flashlights have a reflector giving a wide enough beam of light. But if you want a point — for example, the light pointer of the lecturer? Narrow beam, as if from hidden lamps in detective films, will Give a simple nozzle. For its production will need a plastic Cup suitable diameter and lens from diascope to view the slides. In the bottom of the Cup making the hole, on which the acetone is glued to the plastic rim of the eyepiece.
Recommend to read
WHAT DOES IT COST US TO BUILD A HOUSE!..
A small summer house that you can build on your own is the dream of many gardeners. In this article, we introduce readers to the development of the Novovyatsky wood panel plant - a project...
THE AIR — SCOUT
The plane of distant radar detection E-1B TRACER. The idea of installing a radar plane to detect air targets first appeared in England in early 1936. But the preference nevertheless was...
