In some libraries wooden pegs are used, driven into holes bored at regular intervals. These cannot be recommended, for they continually get loose and drop out, as the wood warps or stretches under the influence of heat or cold.
Fig. 9 shows the construction of the shelf supports used in the new Record Office, Chancery Lane, London. A hole is drilled in the iron up
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right, and a similar hole in the one side of a piece of stout angle iron. The latter is secured to the upright by a hollow bolt inserted from one side, into which is screwed from the other side a smaller solid bolt. The shelf is laid upon the top of the angle iron, and rests there securely. Objection must be taken to this manner of fixing the shelves, as the projecting surfaces both of angle iron and
