Farnsworth developed a system during World War Two that used television to report the effectiveness of bombing. 

A bomb was equipped with a television camera and transmitter. It was released slightly after the normal bombs from a B-25 and televised the bombs hitting their targets. This allowed a visual assessment of the effectiveness of the bombing.

Here is a North American B-25 equipped with the Farnsworth.  The receiver is located at the taped up portion you see to the rear of the fuselage.

A picture of the receiver.

(Thanks to Don Patterson for the pictures and information)