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美国的Aldon公司新近研制的轨上走行式轨距读数器,可应用于测量线路的轨距,其量程为美国标准轨距±2英寸。这台仪器为便携式,它由二个焊接的钢元件套叠组合而成。尼龙导轮可放置于轨顶及其侧面,并在轨道上移动,以使其与轨顶以下5/8英寸的点接触。经久耐用的元件、受压弹簧、齿条和小齿轮组装于套筒内部,它将随轨距的变化而起反应,然后驱动表头的红色指针。这种仪器经改进也可供窄轨与宽轨铁路使用。
The newly developed railroad track gauge from Aldon in the United States can be used to gauge the gauge of a line measuring ± 2 inches of the American standard gauge. The instrument is portable and consists of two welded steel elements telescopically combined. Nylon guide wheels can be placed on the top of the rail and its sides and moved in orbit so that it comes in contact with a 5/8 inch point below the top of the rail. Durable components, compression spring, rack and pinion assembly inside the sleeve, it will respond to changes in track gauge, and then drive the meter’s red pointer. This instrument is also improved for narrow-gauge and wide-gauge railways.