'I have been employed for two months in experiments upon a telegraph
of my own invention. By day, at eighteen or twenty miles distance, I
show, by four pointers, isosceles triangles, twenty feet high, on
four imaginary circles, eight imaginary points, which correspond
with the figures 0, 1, 2, 3, 4, 5, 6, 7, so that seven thousand
different combinations are formed, of four figures each, which refer
to a dictionary of words. By night, white lights are used.'

Dr. Darwin in reply says: 'The telegraph you described, I dare say,
would answer the purpose. It would be like a giant wielding his long
arms and talking with his fingers: and those long arms might be
covered with lamps in the night.'

It is curious now to read Mr. Edgeworth's words: 'I will venture to
predict that it will at some future period be generally practised,
not only in these islands, but that it will in time become a means
of communication between the most distant parts of the world,
wherever arts and sciences have civilised mankind.'

It was some years later, in 1794, when Ireland was in a disturbed
state, and threatened by a French invasion, that Edgeworth laid his
scheme for telegraphs before the Government, and offered to keep
open communication between Dublin and Cork if the Government would
pay the expense. He made a trial between two hills fifteen miles
apart, and a message was sent and an answer received in five
minutes. The Government paid little attention to his offer, and
finally refused it. Two months later the French were on the Irish
coasts, and great confusion and distress was occasioned by the want
of accurate news. 'The troops were harassed with contradictory