International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 442
b is re-leased, the air ^Fig. 199. flows back into it; the pressure upon the water is re-moved, the air within the image ex-pands ; the image, again becominglighter than water, rises to the topof the jar. 1073. Heros Fountain.—He-ros fountain derives its name fromits inventor, Hero, who lived…
Railroad engineering
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer01inte-309-131.webp)
