The Child's Book of Nature for the Use of Families and Schools Intended to Aid Mothers and Teachers in Training Children in the Observation of Nature. Revised Edition. Part 3: Air, Water, Heat, Light, etc. (1886)
Hooker, Worthington · Harper & Brothers · leaf 74
balloons and bubbles. GS How the balloon is made to come down. … the balloon itself, for that is made of such light material that the cords would tear out with the slightest pull upon them. How do you think the person in this car manages when he wants to come down? So long as all the light gas remains in