capacity of the buckets will be increased, and the counter will indicate a
discharge less than is really the case, and _vice versa_. If the level
descends as far as to the orifice in the partition, _hh'_, the gas will
flow out without causing the apparatus to move. The water is introduced
into the counter through _f_, which is closed with a screw cap, and
passes through the opening shown by dotted lines into the reservoir, RR',
whence it flows to the box, BB', When it has reached the desired level, it
gains the orifice, _r_, of a waste pipe, escapes through the siphon,
_ruv_, and makes its exit through the aperture, _b'_, when the screw cap
of the latter is removed. If, by accident, the level of the water should
fall below a certain limit, a float, _f_, which follows its every
movement, would close the valve, _s_, and stop the flow of the gas.
Finally a tube, _tt'_ soldered to the lower part of the tube, _lnl'_, and
dipping into the water of a compartment, P, serves to allow the surplus
water to flow out at _b'_. To prevent the apparatus from being disarranged
upon the drum being revolved in the opposite direction, there is fixed to
the axle, _aa'_, a cam which lifts a click, _z_, when the rotation is
regular, but which is arrested by it when the contrary is the
case.--_Science et Nature_.

* * * * *




DOBSON AND BARLOW'S IMPROVEMENTS IN HEILMANN'S COMBERS.


Next to the mule, there is no doubt that the most beautiful machine used
in the cotton trade is Heilmann's comber. Although the details of this