Demonstrations of signalling techniques - from the raised thumb to semaphore.
Story about various ways of signalling. Part of the WAIT FOR IT! issue.
Shots of various forms of traffic signals. Shot of woman driving car and giving a hand signal. Shot of policeman on traffic duty. Shot of traffic lights.
Shots of a model of an ancient French semaphore tower, passing signals with its arms.
Shots of soldiers using a heliograph to send messages over distances using mirrors and reflected light.
Animated explanation of the system of semaphore towers devised by Sir Home Popham. CU map of message sending system from Kent and Hampshire ports to London. Animation of older style of tower.
Shot of railway junction. Small models from the Science Museum are used to explain how railway signals are used. Shots in signal operation room of the Southern Railway near Brighton. A large illuminated board shows the position of signals on the railway network. Various shots of railway signals.
A young woman uses her thumb to signal that she wants a lift. A car drives past. The woman reaches down and shows some leg - the car swiftly reverses to pick her up.