justed so that, when the know, that other kinds of dust besides flour are explosive access with a ladder, it becomes a matter of considerable boiler is properly filled with water, the weight on the lever under certain conditions. He says: The loft of my spoke importance to engineers to be able to… … pregnated with gas evolved and allows the water to flow by friction; and that the ex- into the boiler; when it de- : plosion and fire occurring in scends the valve is wholly or flour mills are’ ‘precisely of the same nature and due to the | posts -with ease in order to be able to execute there the…
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