Excerpt from Letter From the Secretary of the Treasury: Transmitting Report of Special Commission of Experts as to Means of Improving Vault Facilities of the Treasury Department
As a general rule, the most vulnerable part of the structure is the door and its fastenings and the ad jacent parts of the walls. The door is commonly made thicker, often much thicker than the walls of the chamber elsewhere, and it is re'enforced, and its locking and bolting systems are made effective for their purpose by the most ingenious devices to be found in the whole range of mechanics. It is here, in fact, that the ingenuity of the modern mechanic is mainly demanded and principally displayed.
The door of the safe or vault is constructed, like the walls of the chamber itself, of alternate layers of soft and ductile, and hard and brittle, steel. The only opening through it is for a small steel spindle, also made Of combined hard and soft material, Often twisted together and welded into a single piece; and even this small hole, plugged as it is by a piece extremely difficult to attack or remove, is now Often omitted, and the purpose of the spindle, that of moving the bolts when released by the lock, is accomplished by an automatic system of mechanism, set in operation at the desired hour by means of a time lock, having a clock movement capable Of determining the pre cise moment at which this action shall take place, and as previously arranged by the officer in charge of the safe.
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