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How these rubber tubes battery life They look odd, these slotted tubes of hard rubber, but just read of the wonders they work for a material handling system HESE tubes are the heart of the Exide- Ironclad Battery. They contain the vital “active material” without which there can be no current. There are dozens of these tubes in each cell, for they make up the positive plates. Through the many fine slots the liquid solution flows freely. But the precious solid matter cannot easily escape. Its loss is retarded to such an extent that the normal working life of the active material is greatly prolonged. You see this same simple principle at work in a coffee percolator or when you drop a little bag of tea leaves into a pot of boiling water. Yet, simple as it is, storage battery engineers worked for years before they per- fected this means of increasing battery life. Great power—great speed In addition to its long life you'll find amaz- ing power and speed in an Exide-Ironclad Battery. You'll find built-in strength—a rug- gedness that will withstand the hardest bumps and jolts. You'll find great charging efficiency — the ability to take current in quickly, easily, and with little waste. And finally, you'll find unfailing dependability, year in and year out. Don’t miss all these wonderful advantages any longer. Start saving money on your ma- terial handling costs now. During the past five years the number of Exide- Ironclad Battery users has increased 53.3%; the sale of new Exide-Ironclad Batteries for new mo- tive power vehicles (street trucks, industrial trucks and locomotives) has shown consistent increase each year and a total increase of 99% over this period. tT #46 LA Scores of these firms started with one Exide-Ironclad and now use nothing else. If you have not yet tried this amazing battery you are overlooking a bet. Write us for booklet No. 2865, “Facts for consideration in selecting a Storage Battery.” Cross-section showing how the rubber tube retains in place and retards the loss of the active material of the plate. The slits give the electrolyte free access to the active material. The Exide- Ironclad positive plate consists of a metal frame y Observe xid!e Ls October 27, from which extend vertical J R o N C LA D 1927 a -. metal conducting _rods, each BATTERIES surrounded by active material and cased in a slotted rubber }§ THE ELECTRIC STORAGE BATTERY COMPANY, Philadelphia tube. Exide Batteries of Canada, Limited, Toronto MARINE REVIEW—October, 1927 55