[7] In this, as in other methods of employing power, the moderns had been anticipated by the ancients; and though hydraulic machinery is a comparatively recent invention in England, it had long been in use abroad. Thus we find in Dr. Bright's Travels in Lower Hungary a full description of the powerful hydraulic machinery invented by M. Holl, Chief Engineer of the Imperial Mines, which had been in use since the year 1749, in pumping water from a depth of 1800 feet, from the silver and gold mines of Schemnitz and Kremnitz. A head of water was collected by forming a reservoir along the mountain side, from which it was conducted through water-tight cast-iron pipes erected perpendicularly in the mine-shaft. About forty-five fathoms down, the water descending through the pipe was forced by the weight of the column above it into the bottom of a perpendicular cylinder, in which it raised a water-tight piston. When forced up to a given point a self-acting stop-cock shut off the pressure of the descending column, while a self-acting valve enabled the water contained in the cylinder to be discharged, on which the piston again descended, and the process was repeated like the successive strokes of a steam-engine. Pump-rods were attached to this hydraulic apparatus, which were carried to the bottom of the shaft, and each worked a pump at different levels, raising the water stage by stage to the level of the main adit. The pumps of these three several stages each raised 1790 cubic feet of water from a depth of 600 feet in the hour. The regular working of the machinery was aided by the employment of a balance-beam connected by a chain with the head of the large piston and pump-rods; and the whole of these powerful machines by means of three of which as much as 789,840 gallons of water were pumped out of the mines every 24 hours--were set in operation and regulated merely by the turning of a stopcock. It will be observed that the arrangement thus briefly described was equally applicable to the working of machinery of all kinds, cranes, &c., as well as pumps; and it will be noted that, notwithstanding the ingenuity of Bramah, Armstrong, and other eminent English mechanics, the Austrian engineer Holl was thus decidedly beforehand with them in the practical application of the principles of hydrostatics. [8] Dr. Brown published a brief memoir of his friend in the New Monthly Magazine for April, 1815, which has been the foundation of all the notices of Bramah's life that have heretofore appeared.