eet per second. The result will be that 72 SCIENCE rniMEKS. [VlllKATIKO a few seconds after the gun lias heen fired 1 hIuiUlicar the sound that lias tvavfllid back from the cliffsjust as if another gun had been iired. Now thissound is called an echo. You thus see that in tlu- case of echoes wo… … lis. 22. it strikes. A veiy cuiious experiment is that whichis shown in the above figui-e. Place tAvo largehollow reflectors at some distance from one another,and in a point called the focus of the one put awatch, while you place your ear in the focus of theother; you will then hear the ticking of…
Physics
Internet Archive · University of Toronto Libraries · Public Domain Mark 1.0. Free to use for anything.
