John McTammany turned to making voting machines after he couldn't find a market for one of these devices.  
Melville Clark invented the standard format used by these devices.  John McTammany turned to making voting machines after he couldn't find a market for one of these devices.  These devices were improvements on an impractical machine called a Cylindrichord which had to be wheeled out of a cabinet.  The first of these devices to become popular in the United States was Edward H. Leveaux's Angelus.  Early ads for these devices promised "perfection without practice".  These devices read from a Mignon, which Edwin Welte based on a (*) Jacquard loom.  Pneumatic components of the first of these types of devices prevented them from having different types of dynamic levels.  Consumers would purchase rolls for use in these devices.  Electric motors are used in these devices to operate the pedals.  For 10 points, name these musical instruments that were capable of automatically playing pre-programmed keyboard music.
Melville Clark invented the standard format used by these devices.  
player pianos [or pianola] 