|Project by Rick M||posted 02-23-2014 01:49 PM||2118 views||6 times favorited||10 comments|
This is a modernized reproduction of the plumb level as drawn in Peter Nicholson’s The Mechanics Companion, 1831. (pic 3)
A very similar version appears in Thomas Martin’s The Circle of Mechanical Arts, 1813, but I chose the Nicholson version because it has better lines. Here is Martin’s version.
And for comparison, Moxon’s carpenter level and bricklayer level.
My version replaces the string with a brass rod, attached to a wood axle press fit into a roller bearing. The frame is cherry, the plumb bob is ebony, the inlay strip is American holly, finish is beeswax and oil. On v.2 (swap item), I used brass screws and no glue so it can be adjusted. There is no advantage to the rod and bearing, I did it simply to modernize the design and be different. I would show a picture of the bearing in place but after pressing in the axle I couldn’t remove it. The brass rod is actually canted back toward the frame and the plumb bob is flat on the back. On a level surface the pointer will be centered on the white strip. Gravity will push the pointer toward the low side. The bearing is a 1/4×3/8×1/8” metal shielded bearing that is press fit into a hole drilled top center. The ebony axle has a small tenon on the back that fits into the bearing. It works like a plumb bob, gravity forces the pointer toward earth and when aligned with the holly strip the base is level.
Plumb levels have been around for at least 4500 years. They were used by Egyptians to build pyramids and the Romans used variations for surveying and construction. Here are a few other types: