BENCHES AND SHELVES. A continuous bench should be run round the remainder of the room, its top level with that of the sink, and of a width which must be settled by circumstances—say, from Is to 24 in. This may be covered with sheet lead, treated with any proof varnish or painted. It may be left plain without much harm being done, cept that it will be more troublesome to keep clean. A number of shelves for bottles, chemicals, etc., should be arranged with due regard to space and convenience, their accessibility to the operator being the chief consideration. The shelves in tended for those articles or reagents which will be constantly in use should be placed over the work-bench within easy reach ; while the heavier and less frequently used accessories may be put farther away. Shelves should be made underneath the benches in the form of gratings, to hold dishes of various sizes when not in use, as shown by Fig. 363, which is a good example
of how the shelves and benches should be able ; these cause the water to issue in a finely divided spray, and are turned on and off by simply swinging the arm from side to side. A rose attachment, which can be fixed to any ordinary tap, is now procurable ; this also serves to filter off the grosser im purities of the water (see Fig. 205, p. 125). A common mistake in fitting is to fix the taps too high, thus bringing about con siderable splashing. At the same time, it must be borne in mind that the lower the arranged. It will be noted that the win dow has been blocked out with an opaque wooden frame, and that ventilation is effected by means of a light-trapped con trivance above.