ith 12 in. Telescope.#
Same as above. Price #$5500.00#

#Note.#--We are equipped to construct larger instruments and are glad to
give prices on application.

[Illustration: A 131]

[Illustration]

The above cut shows a driving clock for our standard 6 in. telescope.

We have constructed clocks for a number of larger telescopes among others
the clock for the 24 in. Lowell Refractor.

ACCESSORIES TO TELESCOPES A101 TO A135.

#A140. Finder# fitted to 3" telescope. Price #$12.00#

#A141. Finder# fitted to 3 1/2" telescope. Price #$15.00#

#A150. Positive Eye Pieces.# (Ramsden), focus 6 mm. to 25 mm.
Price #$4.50#

#A151. Negative Eye Pieces.# (Huygenian), focus 5 mm. to 25 mm.
Price #$4.50#

#A152. Diagonal Eye Piece.# The prism of the eye piece has guaranteed
optically plane surfaces and will not affect the definition of the
telescope. Price #$12.00#

#A153. Terrestrial Eye Piece#, focus 25 mm. Price #$12.00#

#A154. Sun Caps#, to fit above eye pieces. Price #$1.50#

The outside diameter of all our eye pieces is 1 1/4" excepting those used
in our Micrometers.

[Illustration: A 201]

#A201. Position Micrometers for 6" to 8" Telescopes.# Circle 15 cm.
diameter, divisions on solid silver, verniers reading to 6 min., slow gear
motion for rotating, electrical illumination, provided with different color
screens. Screw guaranteed of highest accuracy. Price #$200.00#

#A202. Position Micrometers for 4" to 5" Telescopes.# Similar to above but
rotation by hand and construction somewhat simpler. Price #$100.00#

[Illustration: A 203]

#A203. Small Position Micrometer for 3" to 4" Telescopes.# Circle reads
to single degrees. Electric illumination. Price #$75.00#

[Illustration: A 301]

#Transit Instrument#, with reversing arrangement, illumination with oil or
electric lamp, Filar micrometer with two eye pieces. Weight of axis
balanced by springs and rollers. The circle has a diameter of 150 mm.,
verniers read to 20 seconds. The instrument is mounted on an iron base
plate, which is fitted with azimuth adjustment (not shown in cut).

#A301. Transit# with 2" Telescope. Price