How Pianola Works 1912
How the player-piano works - air passes through the holes in the piano-roll and acts on the bellows mechanism, causing a hammer to strike a key
Picture No
10012519
Media ID
47159169
Size
3568px x 5003px
(2.3MB)
Credit
Mary Evans Picture Library
Source
unnamed artist in Mee's Popular Science, vol 1 page 82
Date
1912
