. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 1839.] THE CIVIL ENGINEER AND ARCHITECT'S JOURNAL. 245 RUNNING GUAGE, FOR measuri:-:g the width of the rails of a This apparatus is, as it were, a skeleton hand truck, consisting of a pair of small wheels and axles, and a handle to drive them. The wheels A B are grooved after the manner of pulleys, so that they rest on a narrow or wide rail without shaking; they are fixed ou the axles C D, and are therefore without shake; the axles turn in bearings; one of the axles
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 1839.] THE CIVIL ENGINEER AND ARCHITECT'S JOURNAL. 245 RUNNING GUAGE, FOR measuri:-:g the width of the rails of a This apparatus is, as it were, a skeleton hand truck, consisting of a pair of small wheels and axles, and a handle to drive them. The wheels A B are grooved after the manner of pulleys, so that they rest on a narrow or wide rail without shaking; they are fixed ou the axles C D, and are therefore without shake; the axles turn in bearings; one of the axles D has a shoulder and pin at its end E, and a washer between the pin and the bearing allows the axle to revolve freely, and yet have no shake endwise. The other axle C moves freely on its bearings endwise; it has a long shoulder at its end, on which is fitted a brass tube F, and a pin and a washer keep it in its place ; the tube has a projecting pin, which passes tlirough a long hole in a piece of iron or brass G, fixed to the framework of the instrument; the pin projects far enough to enter the short end of a light wooden lever or index H, the long end of which points to a graduated arc I. As the instrument is pusliod along, the free axle C slips in and out as the wheel A follows the irregularity of the rail, and by the connexion of the axle with the index, the index points out the width of the rail on the graduated aix. Where a rapid examination of the rails is required, the guage may be hooked to the tender, and the man who watches the motion of the index, may throw on the road any distinctive material, such as oyster shells, broken green glass, red brick or tile, broken earth-ware, chalk, or wooden cubes; so that the workmen will find the places marked which they are to repair. A. C. CURVES ON RAILWAYS. Sir—In the last number of your journal, a correspondent ("Sur- veyor") has given a method of setting out circular arcs for railway purposes by means of ordinates
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