Cyclopedia of architecture, carpentry, and building : a general reference work (1912)
American Technical Society · Chicago : American Technical Society · leaf 401
vethan butts of the same material withoutthe spring; and when once installed, itis practically impossible to throw thespring out of service. For the light andcheaper work, a single spiral spring (Fig.21), costing from 15 to 25 cents, can be used independently of the butt; it is easily unhooked when… … Fig. 20. Heavy Bronze SpringBiitt.
Architecture · Building
Internet Archive · Kelly Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
