For those who don't recognize him, Jason Lamontagne is the young man in the maroon shirt. Possibly the best locomotive boiler man in the northeast.

To quote a posting by Gordon Cook on http://forum.wwfry.org:

"We were hoping to be able to measure the vacuum created by the exhaust and blower in the smokebox, but unfortunately the transducer wasn't sensitive enough to measure the vacuum we were able to achieve. Next time we should be able to get some measurements. The idea is to be able to adjust the components in the exhaust system to improve the draft and being able to actually measure the vacuum should make this much easier. A laptop allows the recording of the vacuum in real time while under way.
However, we may not need a lot of improvement on 9. Steam issued from the open whistle valve about 55 minutes after the fire was lit. So the boiler would appear to steam pretty well already. No. 10 might benefit from whatever we can learn, as that engine can be difficult to fire at times due to its small boiler."

In the pictures, Gordon is the fellow with the black cap, blue shirt (with tear in shoulder), and blue jeans.