As most know, in the beginning Henry Ford depended on outside suppliers for his parts. Those wonderful and mysterious induction coils that after a 100 plus years are still a mystery to some, on the operation and adjustment volumes have been discussed.
According to the Automobile Trade Journal for 1914 the coils originally came from three makers - K-W Ignition Company, Heinz Electric Company and Kokomo Electric Company.
By 1914 Ford was manufacturing and test the coils in house.
I have heard American Crayon made [most] coil boxes? Bud.
George - Sent you a PM
Perhaps not all coils were tested in house. I believe I have a couple "out house" coils. ;>o
Yes Bud, you're correct. 4 years ago I posted a pic on the beginning demolition of the plant in Sandusky, Ohio that produced them, around the 100th anniversary. Russ Herner wrote a great article about the little boxes and the plant a long time ago in the Model T Times magazine.
The article about the coil boxes of Rus Herner was in : Model T Times March - April 2011 # 372 .