* * * * *

To remove paint and varnishes, which resist the action of strong lye,
Dr. Stockmeier recommends a mixture of water of ammonia, two parts, and
turpentine, one part; this applied to the surface to be cleaned will,
after a few minutes' action, enable the paint to be removed by use of
cotton waste or similar material.--(_Bayr. Gen. Ztg_.), Rundschau.

* * * * *




ON GAS MOTORS.


M. Witz, says the _Gas World_, has been conducting a series of
experiments on the Delamare-Deboutteville and Malindin gas engine,
driven by Dowson gas, and in which the gas generator takes the place of
the ordinary steam boiler. The engine was a one-cylinder motor in the
establishment of Messrs. Matter & Co., Rouen. Its power was 100 horse
indicated; the cylinder was 23 inches in diameter, the stroke 38 inches,
and the normal speed 100 revolutions. The engine is of the Simplex type;
the kindling is electric; the cycle of operations is fourfold, with
powerful compression. The Dowson generator is 30 inches inside diameter
and 76 inches in height from the bars to the top. Air is blown in by
steam driven in under the hearth. There is a siphon, a coke scrubber 110
inches high, a sawdust purifier, and a gasholder of 750 cubic feet
capacity, and a pipe to the engine 5.2 inches in diameter. The total
area occupied by this apparatus is 140 square yards, of which two-thirds