. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 1847.] THE CIVIL ENGINEER AND ARCHITECTS JOURNAL. 91 driving in wedges or keys at the end of the roll, which keys should be se- curely retained from moving by shrinking wrought iron collars on the sliaft or axles; the working journals are turned in the wrought-iron shafts, after keying on the rolls, ami the surfaces of the rolls turned ; by which means of luanufacluring rolls for rolling iron and other metals, the inventor is enabled to obtain them with stronger necks or axle
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 1847.] THE CIVIL ENGINEER AND ARCHITECTS JOURNAL. 91 driving in wedges or keys at the end of the roll, which keys should be se- curely retained from moving by shrinking wrought iron collars on the sliaft or axles; the working journals are turned in the wrought-iron shafts, after keying on the rolls, ami the surfaces of the rolls turned ; by which means of luanufacluring rolls for rolling iron and other metals, the inventor is enabled to obtain them with stronger necks or axles. The wrought-iron shafts or axles are pass?d through hollow rolls, whicli the inventor prefers to he cylin- drical openings in the cast iron rollers, but he does not confine himself thereunto, as other shapes may be used. Tlie elaim is for the manufacture of hollow cast rolls fur rolling iron and other metals, and fixing thereunto, wrought iron shafts or axles, as described. GAS METERS. Alex.\nder Angus Croll, of Suffolk-street, Clerkenwell, for " Im- 2];âGranted May 13 ; Enrolled November 13,1846.* The improvements relate to the use of a tumbler apparatus for actuating the valves of dry-gas meters with one partition, which approaches to and re- cedes from the plane of attachment to the side of the meter, but does not pass through the same ; so that the flexible material whereof the diaphragm is partly formed, is bent only in one direction. The improvements consist in the application of an apparatus for working the valve, which depends for its action upon the use of a tumbler, so formed, that on being moved to a point just beyond the horizontal or central position, the tumbler will fall over and instantly change the position of the valve. Fig. 1, Plate VI. is a vertical section of the improved meter; fig. 2, a ver- tical section, taken at right angles to fig. 1 ; fig. 3, is a horizontal section, taken on the line a, b, of figs. 1 and 2; and fi
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