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Cesspool Emptiers with Special Equipment
Page 114
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TILE requirements of municipal authorities in the matter of transport vehicles and appliances are of a specialized character, and to meet them in a satisfactory manner it is imperative to have an intimate understanding of operation conditions. These facts have been fully recognized by Dennis Bros., Ltd., of Guildford, which has established a special municipal department for dealing with the equipments of local authorities. This is undoubtedly one of the reasons that the company's products have achieved such marked popularity in municipal circles.
One of the latest deliveries which it has made in this direction comprises two cesspit emptiers, these having been supplied to the Borough of Gravesend. For some years past such machines have 'been operated in the territory of the Gravesend authorities, but the work has been carried out under contract by a local man. The authorities have recently decided to undertake the work themselves, and it is for this reason that the two machines, shown in an accompanying illustration, have been supplied to the order of the sanitary inspector, Mr. S. G. Plant, Each of the cesspool emptiers has a tank capacity of 1,000 gallons, and its basis consists ofthe Dennis 6-ton chassis, which is standard in all respects, except that one or two minor modifications have been necessitated by the special character of the equipment. Air is exhausted from the tank by a rotary pump which is driven from the gearbox, the controls being so arranged that a high engine speed is impossible during the time that the process is in operation, the pump being considerably geared up. No less than 300 ft. of armoured-section hose are carried on each machine, thus enabling cesspools which are located some distance from the roadway or from firm ground to be dealt with. At the end of the operation the action of the pump may be reversed so as to evacuate the contents of the hose, thus preventing spilling.
Those of our readers who are familiar with Dennis cesspool emptiers will be aware of the fact that this method may be adopted to discharge the contents on to ground which is higher than the level on which the machine is at work.
A fitment of special interest is the deodorizing apparatus which is carried on the near side of the chassis. When the pump is being used as a compressor, it simply draws air from the atmosphere in the ordinary way, but when a cesspool is being emptied it would certainly be unpleasant—and not a little dangerous—for the foul air drawn from the tank to be allowed to escape. It is, therefore, passed through the deodorizing plant. This comprises two cylinders, the smaller of which contains a highly concentrated form of liquid disinfectant. This is allowed to drip through a pipe to the larger cylinder, which is filled with a solid, absorbent substance.