Have a water wheel in the sink, supported on two standards, a. On this wheel, 5, is fixed a crank, c, connected to a bell crank, d, supported by a bearing, c, which is, in its turn, connected to the carriage, f, supporting the developing dish, g, resting on four small wheels. Over the water wheel is a tap or a piece of tube, h, which discharges its water into the buckets of the wheel and sets it in motion. The developer in the dish, g, is by this means carried from end to end, and slow development is deprived of Its terrors. An underexposed plate may be left in the dish for 30 minutes. This machine can also be used for toning and filing prints, keeping them in constant motion without handling. See Fig. 80. - (A. Killar.)

Fig.80.

Sacking Machine 10062