. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . ^-tyHV-^= Fig. 1.—Steam logf^er. MEASURING INSTRUMENTS, ELECTRICAL. 493. Fig. 1.—Volt and ammeter. of the electric-lighting station. The need has been urgent for electrical gauges which areboth simple and accurate—simple, in the sense that their mechanical parts should be few andeasily adjusted ; accurate, in the sense that their operation should be certain, and the error sosmall as practically to be neglected. A mo
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . ^-tyHV-^= Fig. 1.—Steam logf^er. MEASURING INSTRUMENTS, ELECTRICAL. 493. Fig. 1.—Volt and ammeter. of the electric-lighting station. The need has been urgent for electrical gauges which areboth simple and accurate—simple, in the sense that their mechanical parts should be few andeasily adjusted ; accurate, in the sense that their operation should be certain, and the error sosmall as practically to be neglected. A most important series of electrical measuring instruments, designed to meet these con-ditions, has been invented within the last four years by Mr. Edward Weston. It is impos-sible, within any space that can here be afforded,to describe all the many forms of entirely novelinstruments which Mr. Weston has produced,and of which it may safely be stated that theyare rapidly revolutionizing modern methods ofpractically measuring the electric current. Twoof the principal forms are, however, illustratedin Figs. 1 to 4. The Wesfon Direct Current Volt and Amme-t(r.—A perspective view of the exterior of thisinstrument is given in Fig. 1. The details of
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
