摘要 |
<p>In making leaven, freshly produced leaven is fed into a large scale container from below and well-fermented prepared leaven is removed from the surface of the container contents. Freshly produced leaven distributed by a plate g across the base of container a, rises during fermentation to a level s and is sucked off through a hose n into conduit o. The level of the top end of the hose n is regulated by ropes m wound on a drum r. The drum r is rotated by a pole-changing braking motor (not shown) controlled by a float switch q. <PICT:1049090/C6-C7/1></p> |