Small plastic circular slide rule for forecasting the weather by setting the wind direction and barometer reading then looking up on the printed table (on the back of the instrument) to determine the weather for the next few hours. Comes complete with its original box and instruction booklet.
Date
undated
Manufacturer
Nagretti and Zambra
Place Manufactured
London, England
Identifying Numbers
Other number
6276/15
Patent numer on both the instruction book and object itself
