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(Continued from page 144.) CHAIN PUMP.—It is our design to publish engravings of some common pumps, so as to enable many to make them who hav e not had an opportunity of seeing drawings of the same. This engraving is that of the chain pump. It is only an endless chain or belt, A', with a sufficient number of pistons, called buckets, fixed upon the chain at proper distances apart. It passes down through a wooden tube, B, and returns upwards in the same manner in the other tube, D. The chain is extended over two wheels,E, F, one at the top and the other at the bottom. By turning the upper wheel, the chain ot buckets is put in motion, and the lower part of the wooden tube in which the chain ascends is made in such a manner that the pistons, as they turn around below Will push up the water, into the, tube, in which they are ascending, and then lift it .up as they are moved upwards. The space between each pistpn'of disc is a bucket in the inside of the tube. The pump is worked by a crank in the ordinary way. Many of these pumps are now used, a common chain- being employed, with discs of iron galvanized, or an endless chain of gutta percha, with strong discs of india rubber for the pistons. Any person who can make a elose tube so as to have the pistons work tight in the tube, can put up one of these pumps easily. A rope, a leather belt, or any endless belt will anamp;wer the purpose, but we like the gutta percha endless belt best. The pistons must be allowed to work easily in the tubes. Hoi WATER IN PARIS.—The artesian wells of Grenelle, 600 yards French (nearly 2,000 Jeet English) in depth, gontinue to supply water of 30 Centigrade (86Fah.) throughout the year. It being supposed that a large profit might be derived from a liberal supply of this natural hot water, a company is about being formed for the purpose of boring in each of the forty-eight districts (quartiers) of Paris, an Artesian well. These forty-eight wells are each to be one thousand French yards, or 3,300 English feet in depth, and are expected to yield water ol a temperature varying from 176 to 212 Fah., the latter being the boiling point. The object in view is to establish hot water baths at 20 centimes (about four cents), public wash-houses or laundries—lour in each district-jfurnish families with hot water, and finally to heat apartments, and buildings, by causing the hot water to circulate in tubes, as in the Palace oi Luxembourg.
