Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 447
346 … ESCALATORS IN A CITY STORE. ELEVATORS 33 The armature is connected with a number of solenoids, eachconnected with a separate step of the resistance, and so arrangedthat they require varying amounts of current to actuate them, andthe E.M.T. in the armature actuates these solenoids in rotation,the…
Architecture · Building · Carpentry
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