These are made entirely of iron; the engraving (Fig. 222) explains itself. S is the acid feeder attached to generator, and Z the salt solution feeder attached on top of the fountain.

Fig. 222. - German Acid and Salt Solution Feeder attached to Apparatus.

Fig. 223 is an adjustable salt solution feeder, as frequently used in conjunction with German apparatus.

Fig. 223. - Adjustable Salt Solution Feeder.