A few vintage Woodward Governors on display 
A vintage Woodward series 210105 ALL-SPEED BALANCED PROPELLER GOVERNOR
The head assembly
The pilot valve and head components
Constant speed control head assembly
The head assembly components
View of the speeder spring and pilot valve parts
A vintage type 1P12 propeller engine governor
Hamilton Standard type 1P12-A governor
Hamilton Standard constand speed control
Constand speed control type 1P12-A
Constand speed control type 1P12-A 2 
The gasket on the bottom of the governor
A vintage governor type 1P12 taken apart
Another view of the parts in the governor.