An interesting old Coil

[Alan Douglas]

I know it’s a different type of coil but it’s really cool and it works.  It’s a Signal loose coupler tuning coil I got from America.

If you haven't seen it, there's some historical material on Signal in this discussion on the antiqueradios.com forum:

http://www.antiqueradios.com/forums/viewtopic.php?f=1&t=247416

Whoever Bullphone was, we seem to have two owners here, one coil and one socket. A google search of Bullphone Nightingale turns up some horn speakers by Bullen. One of the images looks remarkably like that coil form.