Steam locomotive operations question

[butter]

Hey all,
My own personal research hasn't turned up much... What are the differences between a Johnson bar and Stevenson reverser bar? Thanks I anyone who knows more about this than me!

 

[nicky9499]

One you push and pull it, the other just goes round and round? The former usually found in the US and the latter on the other side of the pond.

 

[butter]

Okay thats sorta what I was picking up... In other words, the Johnson is a forward-Backward bar and has to go the opposite direction to engage in a different wheel motion, where as the Stevenson is a circular device that is just rotated clockwise/counter clock wise to switch between wheel direction?

 

[Klinger]

here is one to throw everyone off....a Franklin precision reverser.

 

[nicky9499]

Johnson Bar

Stevenson Bar

Klinger, this precision bar thing sounds interesting but I couldn't find any information or pictures about it.