The evolution of the Henderson cylinder

Marty Megregian kindly provided the following photos and comments showing the evolution of the Henderson cylinder from the De Luxe through to the KL (click pics to enlarge, use your browser's back button to return):

De Luxe
KJ
KL
KL cylinders were stamped SD on the cylinder base flange.
Comparison of KL (left) and De Luxe (right) cylinders - note the dramatically different shape between the two.
Comparison of KL (left) and KJ (right) cylinders - note the KL cylinder has less relief in the head area thus raising compression. This is also visible in the individual cylinder photos above.
Side view of KL (left) and KJ (right) pistons. KL used only two rings, KJ three rings.
Top view of KL (left) and KJ (right) pistons. KL has a domed top, KJ flat top.