. Material handling cyclopedia; a reference book covering definitions, descriptions, illustrations and methods of use of material handling machines employed in industry . Fig. 197 are sometimes used for this purpose but are usually notas convenient and satisfactory as the rack and pinion gate(Fig. 197) which slides in guides under the trough and isoperated by a hand wheeK Troughs for screw conveyors will be found describedunder the head of Screw Conveyors. ELEVATORS Hand, Belted, Electric, Hydraulic, Special A Treatise Covering the Development, Construction andApplication of Elevators, Includi
. Material handling cyclopedia; a reference book covering definitions, descriptions, illustrations and methods of use of material handling machines employed in industry . Fig. 197 are sometimes used for this purpose but are usually notas convenient and satisfactory as the rack and pinion gate(Fig. 197) which slides in guides under the trough and isoperated by a hand wheeK Troughs for screw conveyors will be found describedunder the head of Screw Conveyors. ELEVATORS Hand, Belted, Electric, Hydraulic, Special A Treatise Covering the Development, Construction andApplication of Elevators, Including Discussions ofCapacities, Loading and Unloading Time, Speeds,Acceleration, Retardation, Schedules, Locationand Layout, Motive Pow^er, Types of Motors,Povs^er Consumption, Winding and TractionEngines, Control, Types of Controllers,Switches, Braking, Auxiliary Devicesand Safety Codes for the Construc-tion and Maintenance of Elevatorand for Power TransmissionMachinery By A. A. ADLER Member, American Society of Mechanical Engineers. Elevators BEFORE ENTERING INTO A DISCUSSION of the technical fea-tures of the elevator it might be well to review itshistory. A special type of elevator may be proposedfor a given duty; expenditure of both energy and capitalcan often be avoided through a detailed knowledge of his-tory of the development of elevators which may disclosethat long ago such a type had been used and found study of conditions contemporary with its developmentmay also show why it was discarded. The first elevator on record was used for passengers andfreight in the convent of St. Catherine on Mount Sinaiabout the middle of the sixth century; it was operated by acapstan. About the middle of the seventeenth century Vela-yer of Paris invented a flying chair. It was probably op-erated by means similar to that of the present hand the first plunger machine was installed in theCapuohin church at Vienna some time in the latter part ofthe eighteenth century. I
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Keywords: ., bo, bookcentury1900, bookdecade1920, booksubjecthoistingmachinery
