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heliograph
DEFINITIONS OF:
heliograph
1
n
an apparatus for sending telegraphic messages by using a mirror to turn the sun's rays off and on
Type of:
apparatus
,
setup
equipment designed to serve a specific function
v
signal by means of a mirror and the using the sun's rays
Type of:
sign
,
signal
,
signalise
,
signalize
communicate silently and non-verbally by signals or signs
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