Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 443
r thispurpose, either by gravity or by a solen-oid which moves the arm or crosa head;for these controllers are made both ways.Some have an arm workrno; at one endupon a pivot, the other end carrying thecarbons over the contact pieces; othertypes have a cross head which ascendsor descends according… … 344 ELEVATORS 31 may be, is governed by the use of a dasbpot. Tbe earlier formsof daslipots were filled witb a light oil which would flow freely,and the inovement of the plunger in the dasbpot caused the oil toflow from one end of the cylinder to the other, through a verysmall opening, which was…
Architecture · Building · Carpentry
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