It has been a while since I have posted something new from my collection of photos, this one is the attic of an 1865 lutheran church and shows quite plainly the truss system for the roof.
Near the centre of the picture you can see the 1.8th inch wrought iron rod that suspends the centre of the lower chord of the truss. This lower chord is 12 by 12 hewn pine and is 45 feet long
You can also notice how a purling plate sits on top of the trusses and about centre, and the rafters are positioned on top The original roofing lumber visible from underneath is all muley sawn no doubt by a local mill and are quite wide but as usual not that long.
One thing that astounded me when I first visited this location was the excellent condition of the wooden parts after all the years.