Bosch Dual-Coil Question

[AVS619]

My 1912 Model 28 Buick has a Bosch A Dual-Coil on it, which appears to have been installed early on. While I have heard of them I never had one on any of my brass era cars. After years of storage, it is time to bring the Buick back to life but, I do not know how a Bosch A Dual-Coil functions. I see that the larger lever on top switches from Battery ( to Magneto (M) but the smaller center 'lever' switches from Start to Run. Is anyone familiar with this coil and how it should work? I would greatly appreciate any and all information anyone may provide me regarding the use of this coil. While the engine is now freed up and appears ready to start I do not want to try until I have this coil fully understood so as not to do any damage to anything. I do have photos of the coil if anyone would like me to email them (my email is edfors@charter.net). Thank you all in advance. Tom Edfors

[Guest Mochet]

This is from "The Gasoline Automobile" by Hobbs & Elliot, 1915 edition. It describes the Bosch "Dual System" and "Dual Coil."

Phil

Edited March 27, 2012 by Mochet (see edit history)

[Guest Mochet]

Here's the part about the Bosch Dual Coil:

[pistoncollector]

Tom,

I have a number of early cars with the Bosch Dual Coil ignition system. I am not sure what you need to know but I will be happy to discuss the system with you. My email is: pai01@aol.com .

Paul

[gavinnz]

Bosch high tension Dual ignition systems. This is a link to a flicker page with scans I have done of a small booklet I bought a few years ago off ebay. Their is no date but I expect it is pre 1915.

Lots of good information for people who might want to know about these early ignition systems.

Regards

Gavin

Bosch high tension Dual ignition systems - a set on Flickr