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Protected at the Vital Spots Newest Dollar Liner President Hoover leaves nothing to chance—carries 120-cell Exide- Ironclad Battery—Sister Ship President Coolidge safeguarded in similar manner. \BOARD a modern vessel is no place for uncertainties—the uninter- rupted operation of vital spots must be assured. That’s why the Newport News Shipbuilding & Drydock Co. installed Exide Marine Batteries on the President Hoover and the Presi- dent Coolidge. In case of an emergency or peak loads on the emergency generators, the 120-cell Exide-Ironclad that is floated on the emergency switch- board, instantly and automatically takes over the job of furnishing cur- rent for entire emergency lighting system, watertight door system and radio set. When operation of the main plant is resumed, the battery is recharged automatically. This keeps Exides ready for instant service at all times. In addition to this Exide are two 11-cell Exides which operate general interior communication services twenty-four hours a day. A 2-cell Exide Battery for the electrical ther- Partial view of 120-cell Exide-Ironclad : : Battery aboard the President Hoover mometer system used in connection : with refrigerated cargo spaces pro- vides uniform voltage for this system. Exides aboard mean safety and ab- solutely dependable battery perform- ance for any size ship. Learn more about the many applications of Exides in Marine Service. Write for Bulletin —Form 3420. No obligation. THE ELECTRIC STORAGE BATTERY COMPANY, Philadelphia THE WORLD’S LARGEST MANUFACTURERS OF STORAGE BATTERIES FOR EVERY PURPOSE Exide Batteries of Canada, Limited, Toronto MARINE Review—August, 1931 43