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Updated: May 29, 2025
Bud pointed to a small electronic chassis on the workbench, studded with a tangle of transistors, diodes, and condensers. "It's a density-control device," Tom explained. "A substitute for ballast tanks, you might say. It'll enable us to rise or sink to any depth at will, simply by varying our underwater density."
Besides his mask, electronic breathing device, density-control unit, and ion drive, the wearer would now need at least three major additions first, sonar-blinding equipment with electronic control; second, amplifying equipment to camouflage the wearer's noise under water; and, third, a portable quality analyzer sonar. "Whew! The miniaturizing job alone will be a king-sized headache!"
"Guess I gunned my new skin-diving jet a bit too hard," Tom said sheepishly. "It was almost a K.O. for me!" Mr. Swift asked Tom about the invention. After explaining how it worked, Tom added with a grin, "Maybe you'd better hang around, Dad, until I install some sort of density-control gadget for my hydrolung. Then I can go up or down, or stay at any level easily."
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