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distance.
[7] A. R. Hinks, R.A.S.; Monthly No-
tices , June, 1909.
11. HISTORY OF THE TELESCOPE
Accounts of wonderful optical experiments
by Roger Bacon (who died in 1292), and in
the sixteenth century by Digges, Baptista
Porta, and Antonio de Dominis (Grant, Hist.
Ph. Ast .), have led some to suppose that
400