Q.Can you state how we may discover at what point of the stroke the eduction passage will be closed? A.To find how much before the end of the stroke the eduction passage will be closed:to the lap on the steam side add the lead, and divide the sum by half the stroke of the valve; find the arc whose sine is equal to the quotient, and add 90° to it.

B. Below the lower valve E is another compartment communicating with a pipe called the eduction pipe, which leads downwards from the cylinder to the condenser, in which vessel the steam is condensed by a jet of cold water.

I I are the steam pipes leading to the steam trunnions K K, on which, and on the eduction trunnions connected with the pipe M, the cylinders oscillate.

A.In fast going engines I would call it sufficient lead, when the eduction port was nearly open at the end of the stroke.