Bosch

     Fuller & Johnson used both Robert Bosch and American Bosch magnetos.  The low tension type 32 was used on the Big 4 Pumper and Double Efficiency engines.  This was a very hot, high quality oscillating magneto with a cast brass body and piggyback magnets and utilized a special cast iron trip head.  All Big 4 Pumping engines used the type 32 magneto.  It sat on a cast shelf on the crankcase and was tripped via an extension arm on the cam rocker.  The trip finer itself was mounted on a rotating cam allowing for ignition timing adjustment.  A separate rod crossed in front of the cylinder and hammered the ignitor open.  On several surviving DE engines exported to Australia has been found a most unique option.  Gone was the complete torsional ignitor trip system.  A type 32 sat suspended on an ignitor plug in front of the engine.  A new high rise ignition cam with a new longer follower arm was fitted behind the cam gear.  On the magneto end was fitted a trip similar to that as used on the earlier vertical Frost-Proof engines.  This whole assembly now rocked to and fro tripping the magneto.  However there was no latch out mechanism like that fitted to ignitor engines, meaning the magneto was tripped even when the governor latched up and the engine was coasting.  So far I'm not aware of any DE engines outside of Australia with this unique setup.