Heliograph, a similar non-tracking device, used for communication
Heliograph | heliograph |
This theory is supported by a letter written by Norris, dated 3 June 1778, in which he notes: "Did this day heliograph intelligence from Dr Franklin in Paris to Wycombe".
This is one of a heliograph array of 96, 13.7-m dishes that circled the present location of the Compact Array.