Is this the one? (I haven't managed to make a copy of the picture that will insert here, either - but what is the circular object at top center - is it a set of points, as in a distributor?). I don't see any text or description to explain the diagram.

THE BOZZ COIL: A NEARLY FREE BUZZCOIL

Here's a way to rig up a liver quivering
BUZZCOIL that runs good on twelve volts.
They find much use on early spark plug
ignition systems, flame thrower exhausts,

and testing your bladder. The relay in
question is a 12V NC/NO. The coil is a
12V with internal resistor for space
requirements . Follow the link
to find all the parts in one box:

http://royalcrossfarm.com/BOZZCOIL.htm:

BOZZCOIL COMPONENTS
Bosch Style Relay ...............................................$7.49
Wiring harness for Relay (much neater)..................$3.49
Universal 12 Volt Coil With Internal Resistor......... $19.99
Universal Resistor only .........................................$5.49