Not wanting to stretch the "Original Floorboard" thread any longer than it is I have started this one, I'am wondering if the Linderman Jointer was used by Ford make wooden firewalls. My 20-22 TT had a made up firewall covered with veneer. It fell apart years ago (along with the rest of the truck still waiting for me to retire to start work on it!!!), My 1920 Touring has a similar firewall construction, along with one bought on T-bay. The core wood on the TT part appears to be Maple.
Here is an ad from 1909-1912 showing the Linderman machine and a sample of the built up planks made by the machine.
This older thread shows examples of dovetail joints from hood shelf supports and a fordor body: http://www.mtfca.com/discus/messages/179374/233010.html?1314939430
Maybe the material thickness was a bit thin in the firewall (and the floor boards) to use the machine?
Model T firewalls were not made that way, and I have never seen any evidence of wood jointed together like that anywhere else on a Model T Ford.
I have samples of floor boards where narrow pieces of wood were joined together with a single dovetail joint (the stock is only 9/16" thick) to make up a wider board. It seems that the earlier boards used a tongue and groove joint in this application. The dovetail joints I have are all from 26-27 floor boards.
Dave S.
I have seen wood joined in the body wood on a touring similar to this. The wood was old but it came apart and you could see where it was bevelled when it was put together.
If I saved the pieces, I will take pictures and show you.
The top bow of my '30 Model A sport coup had a double dovetail joint in it--in fact, I used the joint to lay out what shape the bow had originally-as it was bent down from years of snow in the winter!
T'
David D.