for each bucket, or 38 /
100 of a cubic foot.

The spill from this capacity of bucket being sufficient to compensate
for the friction of the shaft journals.

The lifting buckets of the noria class, Figs. 26 and 27, can be made of
positive dimensions to suit the computations as above; but those of the
tympanum class, Fig. 25, should be made of dimensions to conform with
the required capacity at the moment of leaving the water, as the water
at this point flows into the arm.

(_To be continued_.)

* * * * *

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
are built on. The anthracite employed was from Swansea, containing 5.4
per cent. of ash. The observations made with a string friction brake
were continued for 68 hours, everything used being carefully weighed and
measured. One day the machine was worked for 151/4 hours on end; the other
days it was worked with an interval of half an hour every 12 hours to
clear the hearth, poke the fire and lubricate the machine; and it was
clearly established that with a big enough generator it would be quite
possible to work