two foot Forney brakes

This is the first I've "surfed" across your pages. Looks interesting. What I've been attempting to find out-
1 What did the Eames Vacuum Brake System Muffler look like on top?
2 Does anyone know of a picture in any reference?
3 I've asked around in the 2 foot circle and I once got alot of info, except what the top of the exhaust muffler looked like.
4 Does anyone have a drawing of one?
I have a copy of an Eames brochure which shows how many of the components looked and functioned but of course not the muffler portion. Many early engines ran either a straight pipe up, or into the smoke box to quiet it down. The detail will be used on a 1-19th scale live steam engine which I've been running sans the muffler details.