Large quantities of petrol have to be stored by the
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Grosse Berliner Motor-Omnibus Gesellschaft, and this is done according to Section 17 of the Police Regulations, whereby the use of pressure derived from some non-combustible gas, such as carbon di-oxide, is prescribed. The system adopted is that of Martini-Hiineke, of Hanover, to which system we
referred in our issue of the 2nd of May last (page 225). Our first illustration shows the valve-case opened : the two valves. to the left are reducing valves, and are connected to four containers situated under the metal plates at the foot, a short distance from the wall. In connection with the system there is a " dryer " for removing any liquefied carbonic acid, and this ensures that no liquefied CO2 is passed through with the petrol. A " Zaplenkontrolle," or gauge, indicates whether the underground tank contains more or less than 12,000 litres. This " Zapfenkontrolle " is but faintly shown on the extreme right in our first illustration. The petrol is displaced from the tank by the pressure of the CO2, and, apart from its safety and freedom from the risk of fire, it is only the matter of a few; minutes to fill up the tanks of a motorbus,