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B

REFERENCES.

A Telescope Tube . B Counterpoise Weight-
C Dark frame. D Slide of Dark frame.

E Brass Tube, sliding into place of Eyepiece.
F Plate of Metal screwed to ɛ. G Diaphragm
H Opening in tube for Diaphragm. K Clips for
fixing ctor
↳ Barlow's Lens, sliding
into place of Eye-piece.

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THE

31873

ASTRONOMICAL REGISTER:

A MEDIUM OF COMMUNICATION

FOR AMATEUR OBSERVERS, AND ALL OTHERS INTERESTED IN THE
SCIENCE OF ASTRONOMY.

VOL. IV.

NOS. 37 TO 48: JANUARY TO DECEMBER, 1866.

LONDON:

J. D. POTTER, 31, POULTRY, & 11, KING ST., TOWER HILL,

1867.

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