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TWO:Both the boys were greatly interested in the various processes of work that were visible on shore. Groups of men were to be seen cutting reeds for fuel, or for the roofs of houses, where they make a warm thatch that keeps out the rain and snow. Other groups were gathering cotton, hemp, millet, and other products of the earth; and at several points there were men with blue hands, who were extracting indigo from the plant which[Pg 346] produces it. The plant is bruised and soaked in water till the coloring-matter is drawn out; the indigo settles to the bottom of the tub, and the water is poured off; and after being dried in the sun, the cake forms the indigo of commerce. In many places there were little stages about thirty feet high, and just large enough at the top for one man, who worked there patiently and alone. Frank could not make out the employment of these men, and neither could Fred. After puzzling awhile over the matter, they referred it to Doctor Bronson.

A hydrocyclone (liquid cyclone) injects treatment solution into stationary equipment to perform separation, classification, and concentration, and is an innovative separator with a very simple structure and no drive unit.

Structure of a hydrocyclone (liquid cyclone)

A suspension containing fine particles of several micrometers or more is supplied to a cylindrical container circumferentially at high speed. And as a result it starts to rotate and a centrifugal force is generated. At this time a gravitational acceleration of several tens of thousands of G is generated in the circumferential direction, and thus leading to fast sedimentation and concentration of the fine particles. The separated concentration can be freely selected by changing the supply rate (supply pressure and flow rate) and the flow ratio of the outlet. Our hydrocyclone (liquid cyclone) was designed and manufactured to classify and concentrate fine particles, and so has a small element.

THREE:Through this active scene of refreshment and recreation, our party strolled along, and at length came to the gateway of the temple, an enormous structure of wood like a house with triple eaves, and raised on pillars resembling the piers of a bridge. This is similar to the gateway that is found in front of nearly every Japanese temple, and is an imposing ornament. On either hand, as we pass through, we find two statues of demons, who guard the entrance, and are gotten up in the superlative degree of hideousness. When the Japanese give their attention to the preparation of an image of surpassing ugliness, they generally succeed, and the same is the case when they search after the beautiful. Nothing can be more ugly[Pg 127] in feature than the giants at Asakusa, and what is there more gracefully beautiful than the Japanese bronzes that were shown in the great exhibitions at Philadelphia and Paris? Les extr��mes se touchent."Yes," I interrupted, beginning to boil.

• Equipment costs can be reduced.
• Operating costs can be reduced.
• Maintenance costs can be reduced.
• Any change in raw material and product can be easily addressed.
• Large amounts can be treated in a small area.
• Separation and cleaning are easy because of the simple structure.
• Simplified control
• This equipment can be operated in synchronization with external devices.
• Alarm and interlock mechanism.

THREE:

• Classification and concentration for the manufacture of inorganic powder materials
• Classification of ceramic materials
• Removal of fine particles, including iron powder
• Removal of fine particles from pigments
• Removal of fine organic particles from solvents
• Separation of starch and yeast
• Removal of fine particles from high-temperature strong acid solutions
• Removal of fine particles from low-temperature solutions