Bill Frisk inquired about a 1914 Steinway Welte that was later
equipped with a roll changer.  I believe it was around 1928 that
Welte introduced the Welte Multi-Control for Welte Mignon pianos.

These roll changers were made by the Automatic Musical Instrument
Company of Grand Rapids, Michigan.  They used an 8-roll carousel
arrangement similar to that used on their National Coin Piano, but
re-designed, more robust and sophisticated.

A few years earlier (1925-1926) Welte offered the Multi-Control for
their pipe organs which used a vertical bicycle chain driven carousel
arrangement that held 10 rolls.  I am nearing completion of a total
restoration of one of these bicycle chain changers.

There is some information on the Multi-Control here:

http://www.mechanicalmusicpress.com/registry/nat_auto/nat_auto_p03_mcon.htm 

John Wrasse owns one of the 8-roll piano changers (I think it came off
of a Bush & Lane piano) and attached are some photos John had sent me.

Dave Krall
Hammond, Indiana

 [ http://www.mmdigest.com/Attachments/18/06/15/180615_050408_IMG_0689.JPG 
 [ http://www.mmdigest.com/Attachments/18/06/15/180615_050408_IMG_0692.JPG 
 [ http://www.mmdigest.com/Attachments/18/06/15/180615_050408_IMG_0691.JPG 
 [ http://www.mmdigest.com/Attachments/18/06/15/180615_050408_IMG_0690.JPG