thimbles to fit over the chair legs, and plugs of rubber fastened into holes, have been tried, but they are soon dragged off in rooms where there is much traffic. The most satisfactory form seems to be a round rubber or leather pad the same diameter as the chair leg, screwed into it, but the screw hole must be countersunk, so that the head of the screw shall not project and scrape the floor.
One of the most useful appliances in a library is the "Walker" adjustable book and card rack, shown
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in Fig. 55. The wire partitions are movable, and can be adjusted to any space. It is useful for sorting catalogue slips, as with it they can be kept in an upright position, and do not require to be spread out over a large surface. The physical fatigue thus saved will be apparent to any one who has had much experience of alphabetising catalogue slips and cards. The rack is suitable also for holding the cataloguer's books of reference upright on the table in front of him, and so keeping them close to hand. Sorting trays are also a great convenience to the card cataloguer, as they save a great deal of
