ClipArt ETC
"Procure an open organ-pipe, at least one side of which is made of glass. While the pipe is emitting its fundamental tone, lower a small ring with a paper bottom, on which a little fine sand has been strewn, as shown. Just inside the upper part of the pipel, the sand dances...its motion becoming less energetic as the ring approaches the middle of the pipe." -Avery 1895

Organ Pipe

"Procure an open organ-pipe, at least one side of which is made of glass. While the pipe is emitting…

"Bow or pluck the string of a sonometer near its end, thus setting it in vibration as a hole. The string will have the appearance of a single spindle as shown, and will sound the lowest tone that it is capable of producing." -Avery 1895

Sound Wave, fundamental frequency

"Bow or pluck the string of a sonometer near its end, thus setting it in vibration as a hole. The string…