for measuring and recording Water. 273 
of these hydrometrographs in the Bavarian salt-works ; and to 
the conviction of thousands of strangers, who have seen these 
works. 
With respect to the application of it in this country, as it can 
be constructed upon any scale, either for measuring the largest 
quantities of water or other fluids, or the smallest, so there are 
numerous instances where such an apparatus might be highly 
useful ; as, for registering the quantities of water delivered from 
water- works ; the daily supply of a stream of water, employed 
in actuating a water-wheel, or in the irrigation of a piece of 
land ; in measuring and recording the quantities of wort or beer 
in breweries ; and of brandy, or other valuable liquors in distil- 
leries, he. even down to pints and cubic inches, to the greatest 
nicety. Nay, a machine of this kind, constructed upon a small 
scale, might be usefully employed in meteorology, as a con- 
venient and elegant measure of the quantity of rain fallen 
every week or month throughout the year. 
Description of the Machine . 
In Plate VII. figs. 1. and 2., a a are two square vessels, each 
capable of containing more than five cubic feet of water, or 
other fluid ; these are partly filled and emptied alternately, in 
the following manner : h is a moveable trough, mounted upon 
an axis, into which the water is received from the pipe or main 
c ; in each of the vessels, a a, is a hollow float of copper, d d , 
which rising with the water, by means of an adjustable stud, e , 
(shewn separately in fig. 3.), sliding upon the stem of the float, 
gives motion to a tumbler f which, by means of the arm g , con- 
nected with a rod A, descending to the trough h, reverses it, 
and causes the water to flow into the other vessel, at the same 
time opening a conical valve i, at the bottom of the full vessel, 
and discharging the water through it. When both vessels have 
been filled and emptied, a stud j, upon the upper end of the 
stem of one of the floats, moves a lever 7r, turning upon an axis, 
and having a counter weight at its opposite end, and a catch l , 
near the other end of it, which moves a ratchet-wheel m, ha- 
ving ten teeth around it ; and which gives motion to a train 
of five pinions, of six teeth each, and four wheels with sixty 
teeth each. On each of the five arbors are indexes, which shew, 
