Popular Science Monthly/Volume 88/January 1916/Indicator Tells Pursuing Police Speed of Automobile

 

Indicator Tells Pursuing Police Speed of Automobile

LAW-ABIDING motorists who have had the disagreeable experience of being arrested when they were well within the limit of the law will doubtless greet, with delight, the new invention of a Pennsylvania inventor. By means of a speed indicator, similar to the indicators which are found on the instrument boards of nearly every car, the inventor has made a combination license tag holder and speed indicator which shows clearly to the public the number of the car, as well as the exact speed at which the car is traveling.

Here is a chance for
the honest motorist to
tell everybody how fast
he is running

A semicircular plate, with the numbers in multiples of five up to thirty miles an hour, is equipped with a pointer, which indicates accurately the speed of the car. Both the license tag and the indicator plate are perforated, and are illuminated at night by means of a light placed behind them.