In a continuation of our discussion of the British Phototone process,
http://www.network54.com/Forum/27140/message/1333983537/
http://www.network54.com/Forum/27140/message/1333816686/
http://www.network54.com/Forum/27140/message/1335533371/
Here are two articles that may be of interest to some forumites.
http://bixbeiderbecke.com/Bioscope11Jul1928Phototone.pdf
http://bixbeiderbecke.com/Bioscope4Jul1928Phototone.pdf
Albert