I think these date from the late 1920's when 8 cylinder cars started using twin point distributors.

To get equal firing angles after point gaps were set a tool lke this was needed.

I'd appreciate seeing any literature for this.

Tool fits in a 4 1/2" square tin box.

The reissue patent on the dial was granted in 1932.
(It seems to apply only to the dial (Spark Protractor)

Very interesting device...

http://www.google.com/patents/USRE18596

Interestingly, I think I have seen the device drawn in the patent somewhere (GJ?)

Quote from: rusty on May 22, 2013, 05:52:37 PM
The reissue patent on the dial was granted in 1932.
(It seems to apply only to the dial (Spark Protractor)

Very interesting device...

http://www.google.com/patents/USRE18596

Interestingly, I think I have seen the device drawn in the patent somewhere (GJ?)

The patent appears to be for an in circuit running tester, something like a forrunner of this Weidenhof unit I have.

Something sorta like this?

http://www.garagejournal.com/forum/showthread.php?p=2036595

Quote from: rusty on May 22, 2013, 07:06:55 PM

Something sorta like this?

http://www.garagejournal.com/forum/showthread.php?p=2036595

No because that one needs the distributor removed from the engine.

Going back to the Weidenhoff patent there is the description of a crankshaft connected driven motor to connect to the panel so the running engine ignition system gets tested.

Maybe I'm needing that part?

Thanks for your research, meanwhile going forward I've replaced the Allen's 2x perished rubber leads with silicon rubber RSG wire to the original Mueller Universal Pat. Clip No 48-8 so it's ready for use.

Original red lacquered bulbs are Eagle 6-8 volt