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one and a-half inches thick, and the tele-
scope was fixed near one end with a coun-
terpoise. The telescope-tube was a double
cone, to prevent flexure. Three horizontal
and three vertical wires were used in the
focus. These were illuminated by a specu-
lum, near the object-glass, reflecting the
light from a lantern placed over the axis,
the upper part of the telescope-tube being
359
