BOOK VIII 



305 



A— Upper cross launder. B— Small launders. C— Heads of strakes. 



D— 'Strakes. E— Lower transverse launder. F— Settling pit. G — Socket 



IN THE sill. H — Halved iron rings fixed to beam. I— Pole. K— Its little 



scrubber. L— Second small scrubber. 



