Identifier: cassiersmagaz401911newy (find matches)
Title: Cassier's magazine
Year: 1891 (1890s)
Authors:
Subjects: Engineering
Publisher: New York Cassier Magazine Co.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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ut of sight. Each step is car-ried on four wheels, two at each end.The wheelbase from front to back is6 inches longer than the tread. The VERTICAL TRANSPORTATION 167 object of this is to secure greatstability. Some such provision isnecessary, because the load on a treadis very liable to unsymmetrical dis-tribution. Especially on the inclinethe four wheels are each providedwith what is in effect a separate rail.The rails corresponding to the for-ward wheels of a step are situatedahead of those corresponding to therear wheels. This is a necessary pro-vision to enable the wheelbase to be supported while maintaining a hori-zontal position. In the vicinity of thelandings all rails are about at the samelevel. When once the various parts of astep, including the truck, are assem-bled, it is, apart from the wheels them-selves, a rigid whole. There is a hori-zontal arm which carries the twowheels at the end of a step, but theforward and rear part of this armare in different vertical planes. The
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AN ESCALATOR PARTLY CONSTRUCTED i68 CASSIERS MAGAZINE short moving platforms at top andbottom, together with the intermediatestairway; really constitute a train offlat cars continually disappearing atone end and continually reappearingat the other. The passenger standson one of the cars; or, if he chooses,he may step from one to the other.This important fact marks the esca-lator off from every other system. Atno time does the surface on which the One who stands near either endof a step will, naturally, rest his handupon the rail. The upper surface ofthis is so arranged that it movesalong at the same rate as the pas-senger, and thus provides a supportwhich travels with him. In fact, the whole escalator pro-position with reference to the com-fort and convenience of the passen-ger has been thoroughly worked out.

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