In service, the dredger, which ts suction drag in type, combines the principles of a vacuum cleaner and lawn mower, cutting a swath about ten feet wide and two fest dey. Loaded with 4,000 tons of mud and water, the dredger having dug 4 ribbon a mile long, will proceed to causes, economic and. political, "no Gecision was then taken and in 1933, the sixteen firms which tendered were invited to revise their offers. In July, 1933, ten firms made revis_ ed offers and these firms included almost all those having special. experience in building this particular type of dredger, which is quite different in its operation from ordinary river dredgers. The most favourable offer, combined with large experience of this particular type, was that of the German firm of Schichau-
The drag suction type of dredger is the result of an invention made about 1903 by an engineer named Fruchling. Its peculiar feature is that it is not anchored L¢ travels under its own power at a speed of about two knots and scrapes its sue-ion pipe along the bed of the river, thereby foreing the mud into the Pipe. "A powerful pump draws mud mixed with water up the pipe and delivers it into special containers [from which it may be afterwards @ischarged through doors in the, bottom, or by pumping. one injection was feasible a dose of Tce. of the same strength employed, and that experiments using higher concentrations, 4,000 and £000 millions be com "ted in the meantime on small groups of people test their efficacy and reaction Phenomena. Other" points brought fut in the memorandum were referred {o the Epidemiology Committee Dr. Wa Lien-teh remarked though it would be unwise to prediet what the coming summer had in 'Here for Shanghai, the results of Dr. Politzer's investigations of Shanghai waters during the past three years (Gnd. especially" during' the "last eighteen months) showed that there a tendency forthe Group. 1 Vibries (Gimilar in many characterielies fo the true cholera vibrio)
Increase 2s compared to the previous year.
Text read from the printed page and cleaned; old type leaves the occasional error.