In the previous section there is already written about the relationship of these two technicians and why they are mentioned together.

From appendix 9: See Burt, McCollum (Burt-McCollum) and Bristol. We now have an original cutaway drawing for the engine that in the Burt chapter main text is called "Burt".

"Burt engine cutaway"

-Here the sliding sleeves can be seen, and through the mechanism that is anchored at the bottom, it possibly makes a slight turn due to the crank that drives a small connecting rod.