Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise on the care and management of steam engines, boilers and electric machinery (1922)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & company · leaf 968
atures of comparatively low cost. The usual safety devices installed in connection withmodern high grade apparatus are used with this type ofelevator^ including speed governors^ wedge clamp safetydevices for gripping the rails in case of the car attainingexcessive speedy and potential switches.…
