Heres some links to interesting reads
below lens disks
http://books.google.com.au/books?id=QSg ... oQ6AEwCDg8
colour tv 1929
http://books.google.com.au/books?id=Fig ... 8Q6AEwBDgK
sync
http://books.google.com.au/books?id=ESg ... oQ6AEwBDge
The crater lamp so thats what they looked like!
http://books.google.com.au/books?id=QSg ... oQ6AEwCDg8