National Geographic : 1943 Sep
The best shot in the world would be helpless without it! * Imagine trying to aim a huge gun at a tiny dot miles up and traveling across the sky at 300 miles an hour! In many cases, it would be well-nigh impossible if it weren't for an electrical brain that actually makes lightning calculations and aims the gun automatically. All the gunners do is keep two sights centered ontheplane...oneforelevation...theother for direction. The electric brain does the rest. It is vitally important at all times to know the exact condition of the system that operates the electric brain . . . and that's the job of electrical indicating instruments. Today Gruen is proud to be making precision instruments of this type for all services . . .proud to turn our 69 years' experience with Precision watches to this new and vital job. Please remember this . . . when your Gruen dealer has to say, "Sorry, BUYA GUEN WATCH...BUT but we no longer have BUYA WAR BOND FIRST! the particular model you want." The Gruen Watch Company, Time Hill, I Cincinnati, Ohio, U.S .A . In Canada, Toronto, Ont. ERIA'SC SINCE 1 AMERICA'S CHOICE SINCE 1874 GRUEN...MAKERS OF THE PRECISION WATCH...AND PRECISION INSTRUMENTS FOR WAR PRECISION AND THE PRECISIONWATCH ARE THEREGISTEREDTRADEMARKSOFTHE GRUENWATCHCOMPANY. COPYRIGHT1943. THEGRUENWATCHCOMPANY.