GREGORIAN a.
telescope (Opt.), a form of reflecting telescope, named from Prof. James Gregory, of Edinburgh, who perfected it in 1663. A small concave mirror in the axis of this telescope, having its focus coincident with that of the large reflector, transmits the light received from the latter back through a hole in its center to…
LION n.
quite a lion in London at that time. Such society was far more enjoyable than that of Edinburgh, for here he was not a lion, but a man. Prof. Wilson. American lion (Zoöl.), the puma or cougar. -- Lion ant (Zoöl.), the ant-lion. -- Lion dog (Zoöl.), a fancy dog with a flowing mane, usually clipped to resemble a lion's…
PRISM n.
free from color. -- Nicol's prism, Nicol prism. Etym: [So called from Wm. Nicol, of Edinburgh, who first proposed it.] (Opt.) An instrument for experiments in polarization, consisting of a rhomb of Iceland spar, which has been bisected obliquely at a certain angle, and the two parts again joined with transparent ceme…