Word: ballasting
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...ballast-recovery process will bring loss of helium to a negligible quantity...
...went for iron and steel castings and $80,965,000 for steel rails. Purchases of copper, zinc, lead, etc., came to $57,245,000; lubricating oil and grease, $15,678,000; and cement $6,120,000. The sum of $344,394,000 was spent for miscellaneous materials, including ballast, groceries, meat, canned goods, brooms, matches, pencils, typewriters and various supplies...
...Lakehurst a further difficulty arose. So much fuel had been burnt on the journey that the ship was very light. The ballast recovery apparatus installed on one engine compensated only in small part for the loss of fuel weight, and in three attempts at mooring, the drag ropes swung high above the ground crew. Finally Commander Lansdowne had to reconcile himself to "valving" the helium and allowing some 20,000 feet of the precious gas to escape at an estimated cost...
What could disprove the notion of the Shenandoah being a fair-weather craft more happily than this? A moonless night, a heavy thunderstorm, two sessions of heavy fog?none of these seemed to have bothered the ship very much. The difficulty in landing "light" will certainly disappear when the ballast recovery apparatus has been attached to every engine...
...engines is automatically compensated for. When gasoline burns, the hydrogen it contains combines with the oxygen of the air to form water, or rather steam. In the new process the exhaust gases are cooled by huge water radiators, the steam condenses and is carefully collected as water ballast. The Secretary tasted some of this and pronounced it "excellent...