. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 146 THE CIVIL ENGINEER AND ARCHITECTS JOURNAL. [Mat, radially from tlic central shaft, and at an inclination from the perpen- dicular. When these hoppers are used, it will lie necessary to stop the suiiplyof clay as the pistons advance to press it througli the dies: this may he done hy a sliding-plate, or a valve, opening inwards, heing made tu close the bottom of the liopper; or the pistons may be pro- vided with a shield to sliut out the further supply of clay as they ad- v
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 146 THE CIVIL ENGINEER AND ARCHITECTS JOURNAL. [Mat, radially from tlic central shaft, and at an inclination from the perpen- dicular. When these hoppers are used, it will lie necessary to stop the suiiplyof clay as the pistons advance to press it througli the dies: this may he done hy a sliding-plate, or a valve, opening inwards, heing made tu close the bottom of the liopper; or the pistons may be pro- vided with a shield to sliut out the further supply of clay as they ad- vance. In either case it will he requisite to stop the rotation of the sweepers or arms of the pug-mill. INCRUSTATION OF BOILERS. Maximilian Fkancois Joseph Delfosse, of Regent-street, Mid- dlesex, for " Impronme7ils in preventing and nmoring incrustation in ;—Granted August 20, 1S4G; KuroUed February 1817. This invention consists in adding to the water used in steam-boilers a mixture which acts on the precipitahle matters in the water to pre- vent them forming any incrustations on the interior of the boiler, and which will also remove anv incrustations that may have been jire- vionsly formed. This mixture the patentee has named the "antipe- trifying mixture;" it is composed of dry tannic or gallic extract, hydrate ot soda, or soda deprived of its carbonic acid, muriate of soda, and subcarbonate of potash. The proportions will vary accord- ing to the impurity of the water, and to the boiler being stationary or locomotive. If the boiler be stationary, and fed withiresh water, the amount of antipetrifying mixture for 33G hours consumption per horse-power maybe'made by mixing together 12 oz. of muriate ot soda, 2J oz. of hydrate of soda, 2 drachms of dry tannic or gallic ex- tract, and h oz. of subcarbonate of potash. For locomotive boilers, tra- velling on an average about 140 miles each day, the quantity of the mixture per horse-power is in
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