"You could have gotten it up to eighty or ninety degrees by turning on the
electric heater far enough," suggested Hal.
"I wanted to see whether it would be warmer in the depths; wanted to find
out how low I could go and be able to do without heat in winter," Somers
retorted.
"I could have told you that, from my reading, without any experiment,"
retorted Skipper Jack. "Close your conning tower and go down a little way,
and the temperature would gradually rise a few degrees. That's because of
the absence of wind and draft. But, if you could go down very, very deep
without smashing the boat under the water pressure, you'd find the
temperature falling quite a bit."
"Where did you read all that?" inquired Eph, looking both astonished and
sheepish.
"Here," replied Jack, going to a small wall book-case, taking down a book
and turning several pages before he stopped.
"Just my luck," muttered Eph, disconsolately. "Here I've been dull as
ditch-water for an hour, trying to find out something new, and it's all
stated in a book printed--ten years ago," he finished, after rapidly
consulting the title-page.
Jacob Farnum had been no listener to this conversation.
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