. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . g the whole background wouldappear brightest when viewed from be-low by an engineer on an approachingtrain. The angle at which the strips areplaced has a tendency to cause any dirtor grime to settle on the back of thestrips and thus always preserve the il-luminated surfaces clean and bright. Theopen or Venetian blind effect producedby this arrangement of metallic slats issuch as to greatly reduce the wind pres-sure upon the whole surface, with con-sequent economy in weight and in thesupportin
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . g the whole background wouldappear brightest when viewed from be-low by an engineer on an approachingtrain. The angle at which the strips areplaced has a tendency to cause any dirtor grime to settle on the back of thestrips and thus always preserve the il-luminated surfaces clean and bright. Theopen or Venetian blind effect producedby this arrangement of metallic slats issuch as to greatly reduce the wind pres-sure upon the whole surface, with con-sequent economy in weight and in thesupporting members. Not only is the make up of the back-ground itself very ingenious, but themethod of its illumination has beenworked out with an eye to practical details which has rendered the resultproduced most effective. The back-ground is illuminated by means of a lightwhich is more than half enclosed in areflector. The direct light from the lamp,of course, falls upon the background andrenders it bright, but the reflected lightis handled in such a way that a some-what brighter area of illumination is. WORLD SIGNAL, SIDE VIEW. secured on that part of the backgroundover which the moving end of the signalarm sweeps out its arc. The reflector consists of a series offacets, one might almost liken them tothe flat surfaces on a cut glass tumbler. February, 1910. RAILWAY AND LOCOMOTIVE ENGINEERING 61 but they are not necessarily of equalarea and each facet stands at such anangle to the adjacent facets as has beenfound necessar>- to distribute the beamsof reflected light where they will do mostgood. A glance at our engraving. Fig. I,will show the parts of the background tcni of signaling possesses may be men-tioned the fact that color is not dependedon in any way, the day and night in-dications are identical. The system maybe used on automatic or interlocking in-stallations with equal facility, the whiten-ing effect of snow and the cleaning action i. y/^^ ^/y ^^ / ^^ //J^ / y^ \j^^ // w
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