Build a Home Made Telescope
These plans are for a homemade terrestrial telescopes with higher magnification.
IF YOU made one of the telescopes described last month, you already are familiar with the basic information
necessary to construct a terrestrial telescope,
which is one for viewing objects on land. Obviously,
it must show an upright image, and in order
to do this with the astronomical telescope already described,
it is necessary to add two lenses between the
objective and eyepiece, as in Fig. 25.
This type of
erecting system permits added magnification through
Normal lens system: This also is shown in Fig. 25.
The field lens and eye lens making up the eyepiece
are the same as for the astronomical telescope, and
The one shown here
is a Ramsden. The eyepiece together with
the two erectors make an erecting eyepiece,
and all four lenses are mounted at a
fixed spacing in the draw tube.
Designing- your own scope: The best way
to make a scope is to design and test your
own. First, select suitable lenses, Fig. 32,
and run through the simple calculations
and other data. Then make a layout, tracing
the light rays and, at the same time,
check the system on the optical bench....
How to Build Terrestrial Telescopes