Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 441
Fig. 51. Holt with SunkenThumb-Piece. Fi^. .53. Lever Bolt. Via.. .5:!. Knob Bolt. are often used io permit ventilation, or to allow the inmate to learnthe character of a caller before fully opening the door. The ice-box door of the north piazza (see Fig. 69) needs specialattention, as a slight…
Architecture · Building · Carpentry
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