od head are made of brass
and are nicely finished. The telescope is fitted with long rack and pinion
motion. Three celestial eye pieces are included. Price with 2 1/2"
telescope #$90.00#

#A102.# The same as above with 3" telescope. Price #$110.00#

#A103.# The same as above with 3 1/2" telescope. Price #$140.00#

#A104.# The same as above with 4" telescope. Price #$200.00#

#Note.#--All our astronomical telescope have objectives of the standard
focal length (focus = to about 15 times diameter of aperture). The
objective is mounted in the most approved manner and is provided with
adjustment for collimation.

#Note.#--For accessories to these telescopes see page 11.

[Illustration: A 110]

#A110. Universal Equatorial Mounting.# This form of mounting can be used
equally well for celestial and terrestrial observations. The mounting is
made to swivel on the tripod head, in order to set the instrument in the
meridian. The polar axis can be set at any latitude and a graduated arc
gives the exact position. The instrument is set level by means of two small
levels attached to the tripod top. The polar axis is fitted with worm wheel
and worm for slow motion. The handle with the universal joint can be
clamped on either side of the worm shaft. Telescope of 3" aperture and
three eye pieces. Price #$165.00#

#A111.# Same as above with 3 1/2" telescope. Price #$190.00#

#A112.# Same as above with 4" telescope. Price #$250.00#

For accessories see page 11.

[Illustration: A 120]

#A120. Portable Equatorial Mounting with Driving Clock.# This instrument
was designed to meet the demand for portable low priced telescope suitable
for the study of astronomy in the college, high school or for the amateur
astronomer. Every observer and teacher in astronomy will appreciate the
great usefulness of a driving mechanism, which will keep the star in the
field during observation. After several years of experimenting we have
succeeded in constructing a reliable clock which can easily be attached to
our portable telescope mounting.

The instrument is mounted on strong hardwood tripod fitted with iron shoes.
It is attached to the tripod top by a single screw which holds it firmly
and allows adjustment in azimuth. The clock case carrying the bearing for
the polar axis is