Wright, Mark R., 1854- · London : Longmans · leaf 74
Fig. 50. for the smoke to move in straight lines in ajl directions as thesound-waves do. The propagation of sound-waves is not thepropagation of air-particles. Insert a funnel in one end of a long wide india-rubber tube,direct the other end towards a lighted candle, and blow a littlesmoke into this…
Physics
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer01inte-95-20.webp)
