Page:Popular Science Monthly Volume 90.djvu/93

 Where Thieves Can Not Break Through and Steal

���Above: The material handled by the clerks of the Bureau is of enormous value, including finished paper money, stamps and invaluable plates and dies

At right: The Captain of the Watch in his office, where a small arsenal is maintained. Regular army rifles and revolvers are furnished for the watchmen

Below : One of the four major vaults, the door of which weighs twenty-five tons, yet is so perfectly balanced that it can be closed with a movement of the finger

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