The annexed engravings are views of a Water Gauge for steam boilers, constructed by John Heaison, of New York City, who ha taken measures to secure a patent for his improvement. a vertical section ol the lower part of it. The same letters of reference indicate like parts, One vertical tube is made of metal, and the other of glass, and they are connected to the boiler by proper pipes. The metal tube has try cocks inserted in it, and the height of the water in the boiler is indicated by the height of the water in the glass tube. The ends of the glass tube are packed in a peculiar manner, by which the escape of water around them is prevented. A A are the pipes, which are attached to any project horizontally from the boiler. These pipes are connected by the upright tubes, C D. The ends of tube C may be connected to the pipes, A A, in any proper manner. This tube, C, is made of metal, and has two try-cocks, a a inserted in it. The tube D, is made of glass, its ends are inserted in sockets, b b,at the ends of the pipes, A A. These sockets are somewhat larger in diameter than the glass tube, as seen in fig. 2, to allow the spaces between the outside of the tube and the inside of the sockets to be packed with vulcanized india rubber packing, E E. A hollow cylinder, F, fits within the socket, and may be tightened against the in- ia rubber by means of the nut, G, which screws into the end of the socket, and bears against a head, c, in one end of the cylinder. It Will readily be seen that, by screwing up the nut, G, it will press upon the india rubber and cause it to expand laterally, and make it fit tightly around the tube, D, and against the inner surface of the socket, b. The cylinder, F, has two oblong apertures, d d', through its sides at opposite points. The aperture, d, allows the water to pass into it, and then up the glass tube. The aperture, d', receives a nut, e, which prevents the cylinder from turning within the socket. The. nut, e, also serves as a blow-off cock. Both sockets of the glass tubes are alike. H H are stop cocks placed in the pipes, A A, tor the purpose of preventing the entrance of water into the tubes when desired ; I is a blow-off cock placed in the under side of the lower pipe, A. The dotted liae, g, indicates the height of the water in the boiler and the tubes. By this gauge, the placing of the try cocks in the boiler is avoided, and by arranging the two tubes as described an accurate water height gauge is obtained. The try cocks and blow-off cocks keep the tubes clear. The arrangement of the tubes, and their combination it is believed, will enable this gauge to exhibit the correct water level in the boiler, and not be affected by foam, &c. More information may be obtained by letter addressed to Mr. Hearson at No. 13 South William street, this city.