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 3½" 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 1¼" excepting those used in our Micrometers.

A 201