block. The key levers are The Flint and Pere Marquette Railroad runs from and takes up the book, after which the counterweight set for the proper station at the central station in the Toledo, Detroit, Flint, Saginaw, Bay City, through carries the tray out of the path of the carriers. This rotunda.… … operates the receivers in the stacks. Thus, the roller double angles. On eachsideof thecenter girder, and KEY MECHANISM OF BOOK STACK CARRIER. is thrown out and sets the key lever at the same time spaced 634 feet from center to center, are two continu- as the book is delivered to the carrier. The…
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