to which it is applied ; and these frames (see figure 1) are of such size and shape that, where a series of them are com- bined with a series of pigeon-holes, they cover the whole of the ends of the wood.
"Each door frame is a plate of metal, aa, which, when in place, overlaps a part of the ends of the wood-work surrounding the pigeon-hole, the outside of the frame enclosing a greater area than the orifice of the pigeon-hole, and each frame has an ear, bb, which enters the pigeon-hole; but this ear may be continuous, or notched out at intervals. The door is of iron, or other metal, solid at top, and having an opening, e, below, in which a plate of glass is secured, and is hinged to the frame as at cc. It is preferable to locate rods, ff, behind the plate, so as to prevent the introduction of, a hand if the glass be broken, and so to form and hinge the door that when shut it enters within the frame, so that it cannot be lifted from its hinges when shut.
"When the frames are ail in place each frame is riveted or bolted to the wood-work, to fasten it thereto, and is also riveted or bolted to its four neighbors to secure the frames to each other. See hh, figure 2. Thus, each frame is secured to the wood-work, so that it cannot be removed till the rivet or the wood-work is cut away or broken.
"When all the frames are in place a continuous metallic frontage, protecting the wood-work, is presented upon the outside of the series of boxes—that is, the side where the public can approach the boxes.
"Each door bas a lock attached to it, the bolt of which is actuated through the intervention of an arm, k, in the manner and for the purposes set forth in a patent granted for the invention of Linus Yale, Jr., on the twenty-fourth day of October, 1871—No. 120,177.
"An iron door in an iron frame is not claimed as of Yale's invention, as such doors have been used in safe vaults and for furnaces."
It will be seen that the specification of the re-issue makes the invention to consist of two parts: First, a metallic frontage of doors and their frames, the latter covering the ends of
