"The balsa-wood and spruce we ordered some time ago is on hand, and that will keep us busy until other needed materials arrive. We have repaired the big exhibition building in the old fair-grounds, put on new double doors and purchased a good Yale lock for them.
With that he picked up a try-square and pencil and began laying out some work for Paul to cut on the circular saw, while John busied himself at the boring-machine in putting a hole through the center of the big twelve-foot balsa-wood propeller which a little later would be reinforced with a thin jacket of a new metal called "salinamum," which was made chiefly from salt but whose fused components made it as light as aluminum and stronger than tool steel.
Giddings and his son wiped their hot brows as they handed the plane over to its makers. "Whew!" said Bob, "that little mule has got a lot of pull to her." "That she has," supplemented his father. "What sort of material is her frame made of?" "Balsa-wood," said John. "I never heard of that. Is it something new?"