[Shop-talk] Making a trap door safe

[Eric J Russell]

I'm imagining something like the mechanisms at Thomas Jefferson's 
Monticello. When the doors are opened a hidden pulley system could move 
bars - like the trafficators on an olde English car - into the hallways 
around the opening.

Can you upload a photo of the floor doors for us to peruse? Us visual 
learners like photos...

Eric Russell
Mebane, NC

----- Original Message ----- 
From: "Jim Stone"


> I can envision an elaborate system where three barriers would 'unfold' 
> when the door was opened,