Astronomical Instruments And Accessories

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Astronomical Instruments And Accessories
William Gaertner And Company
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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 guaranteedoptically plane surfaces and will not affect the definition of thetelescope. 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

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