“Keep your battery filled with water and see if it doesn’t last you about twice as long,” suggested the radio expert. “Don’t add any acid to your battery, for it’s only the water that evaporates.”
“Will that really do the trick?” asked Joe, wondering. “I don’t just see how——”
“It does just the same,” Brandon interrupted confidently. “All you have to do is to try it to find out. Don’t use ordinary water though. It needs to be distilled.”
“That’s a new one on me, all right,” said Bob, adding gratefully: “But we’re obliged for the information. If distilled water will lengthen the life of our battery, then distilled water it shall have.”
“It seems queer,” said Mr. Brandon reflectively, “how apparently simple things will work immense improvement. Marconi, for instance, by merely shortening his wave length, is discovering wonderful things. We cannot even begin to calculate what marvelous things are in store for us when we begin to send out radio waves of a few centimeters, perhaps less. We have not yet explored the low wave lengths, and when we do I believe we are in for some great surprises.”
“Go on,” said Joe, as he paused. “Tell us more about these low wave lengths.”