. Railway master mechanic [microform] . Urff-f^i Il-fl !!■ fflffUflffl !iS fi+f; Iff! ft!! In \v f tffl-ffi 1 Iff fffffm 90 9Z 9* 96 2900 OZ 04 -Ratio of Total Heating Surface to FireboxHeating Surface. Fig. 16—Ratio of Total Heating Surface to Volumeof Both Cylinders. January, 1904 RAILWAY MASTER MECHANIC Most of the curves speak plainly for themselves, asthe curve of tractive effort, Fig. 5. Arriving at the curves of ratios, the first two whichare the most impressive are those showing the ratio oftractive effort and total weight to total heating sur-face. By the drop of the curve during the
. Railway master mechanic [microform] . Urff-f^i Il-fl !!■ fflffUflffl !iS fi+f; Iff! ft!! In \v f tffl-ffi 1 Iff fffffm 90 9Z 9* 96 2900 OZ 04 -Ratio of Total Heating Surface to FireboxHeating Surface. Fig. 16—Ratio of Total Heating Surface to Volumeof Both Cylinders. January, 1904 RAILWAY MASTER MECHANIC Most of the curves speak plainly for themselves, asthe curve of tractive effort, Fig. 5. Arriving at the curves of ratios, the first two whichare the most impressive are those showing the ratio oftractive effort and total weight to total heating sur-face. By the drop of the curve during the last fewyears the total heating surface is seen to have been in-creased, indicating the greater attention given by de-signers to produce freer steamers and the attempt toplace all available weight within the boiler. Whilewe have seen that both the total heating surface andgrate area have increased, the ratio of the former tothe latter has increased very gradually and during thepast fifteen years the average ratio has remained near-. /87Q BO mo oz 04- Fig. 17—Ratio of Grate Area to Volume of BothCylinders. ly constant. The longer tube is responsible for this,as as clearly shown by the curves in Fig. 12, wherethe ratio of total heating surface to firebox heatingsurface has increased very rapidly since 1894. A curverepresenting the ratio of tube heating surface to fire-box heating surface would have practically the sameform, as the difference between total and tube heating surface is equal to the firebox heating surface; exceptwhere water tubes are used. There is a difference ofopinion extant regarding the advisability of the presentrelation between tube and firebox heating surface andthe subject is worthy of more careful investigationthan has been made since the adoption of wider gratesand longer tubes. The change in the direction of the curve indicatingthe relationship existing between firebox heating sur-face and grate area is so abrupt as to impel attentionto the fact th
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Keywords: ., bookcentury1800, bookdecade1890, bookidrailwaymaste, bookyear1895
