Soap-bubbles
Giant soap bubbles made tough with a special glue.
First named in The Road to Oz, ch. 24
He had invented a machine to blow huge soap-bubbles, as big as balloons
What the books say it is
size as big as balloons 1 chapter
He had invented a machine to blow huge soap-bubbles, as big as balloons, and this machine was hidden under the platform so that only the rim of the big clay pipe to produce the bubbles showed above the flooring.
The Road to Oz, ch. 24
texture tough 1 chapter
Usually, soap-bubbles are frail and burst easily, lasting only a few moments as they float in the air; but the Wizard added a sort of glue to his soapsuds, which made his bubbles tough; and, as the glue dried rapidly when exposed to the air, the Wizard's bubbles were strong enough to float for hours without breaking.
The Road to Oz, ch. 24
Mentioned in
The Road to Oz (1 of 24 chapters)
Connections
created by Wizard of Oz 1 chapter
The Wizard then announced the last act of all, which was considered really wonderful. He had invented a machine to blow huge soap-bubbles, as big as balloons
The Road to Oz, ch. 24