Fig. 81.—“Cresset” Revolving Distributor.
Fig. 82.—“Sypho-Jet” Revolving Distributor.
Two types of revolving sprinklers are manufactured by Messrs. Mather and Platt, Ltd. These are illustrated in [Figs. 83] and [84]. The special feature claimed for the “Pipe Arm” distributor is the overflow centre, as this eliminates the use of joints or seals. Another point of interest in connection with this apparatus is that there are two sets of ball-bearings at the head, one to take the weight of the revolving portion, the other to take lateral movement. In addition there is a set of roller-bearings at the centre, which are arranged to prevent lateral movement, and they can be adjusted to take up any wear that may occur. The “Open-trough” type, [Fig. 84], is provided with a special turbine arrangement at the centre, which it is claimed gives an immediate motion when the sewage is turned on. The distributing troughs being open assist in aerating the liquid, and as it is possible to provide holes in the bottom of the troughs these are able to drain completely dry, and can also easily be cleaned. This apparatus is provided with ball and roller bearings, as described in connection with the “Pipe Arm” type mentioned above.