. Science of railways . CABLE. /Asbestos Fire-FeltLocomotive , Vfc Co. Fig. of Securing Sectional Lagging to the Boiler. delicate and exceedingly strong fibres, which can bespun, woven and otherwise manufactured into manyuseful articles. In addition to its fire-proof qualities,it is also acid proof and practically indestructibleexcept from abrasion. Fig. 1 shows a locomotive boiler undergoing theprocess of covering with a form of manufactured 588 LOCOMOTIVE APPLIANCES, covering known as sectional lagging. From Fig 1the details of its application may be readily under-s
. Science of railways . CABLE. /Asbestos Fire-FeltLocomotive , Vfc Co. Fig. of Securing Sectional Lagging to the Boiler. delicate and exceedingly strong fibres, which can bespun, woven and otherwise manufactured into manyuseful articles. In addition to its fire-proof qualities,it is also acid proof and practically indestructibleexcept from abrasion. Fig. 1 shows a locomotive boiler undergoing theprocess of covering with a form of manufactured 588 LOCOMOTIVE APPLIANCES, covering known as sectional lagging. From Fig 1the details of its application may be readily under-stood. When it is such general practice in stationary andmarine engineering to cover every particle of exposedsteam pipe it would seem much more important to doso on a rapidly moving locomotive where the resultingradiation is very much Fig. 3. Asbestos Covering for Steam Pipes. Asbestos covering, as shown in Fig. 3, for steamsupply pipes to the air pump, train heating system,electric headlight, etc., is gradually but surely cominginto usa THE STEAM ENGINE INDICATOR. The degree of excellence to which the locomotiveand other steam engines has been brought is verylargely due to the use of the indicator. A carefulstudy and comparison of indicator diagrams takenunder different speeds, pressures, and with vari-ous cut-oifs furnishes the only means of showingthe action of steam in the cylinder and of gaininga definite knowledge of the various changes ofpressure that take place therein. An indicator diagram is the result of two mo-tions, namely: a horizontal movement of the paperin exact correspondence with the movement of thepiston, and a vertical movement of the pencil inexact ratio to the pressure exerted in the cylinderof the engine. Consequently, it represents by itslength the stroke of the engine on a reduced scale,an
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