. Railway master mechanic [microform] . y my appreciation of what I considerto be a good, practical article. I have written to eachof our master mechanics and invited his attention to it. December T2, 1903. RAILWAY MASTER MECHANIC January, 1904 The Trend of Locomotive Proportions (Continued from Page 540 of Volume 27.) ONTINUING with the series of tables, thefirst of which appeared- in the December,1903, issue of the Railway Master Mechan-ic, showing the existing- ratios of locomo-tive parts and the changes which these re-lationships have undergone, we presentherewith a table of dimensions and
. Railway master mechanic [microform] . y my appreciation of what I considerto be a good, practical article. I have written to eachof our master mechanics and invited his attention to it. December T2, 1903. RAILWAY MASTER MECHANIC January, 1904 The Trend of Locomotive Proportions (Continued from Page 540 of Volume 27.) ONTINUING with the series of tables, thefirst of which appeared- in the December,1903, issue of the Railway Master Mechan-ic, showing the existing- ratios of locomo-tive parts and the changes which these re-lationships have undergone, we presentherewith a table of dimensions and propor-tions of freight engines, selected as repre-sentative of freight locomotive design fromthe year 1880 to the present time. The figures appear-ing in the table are arranged graphically to demon-strate more clearly and readily the changes undergonein the several dimensions and ratios during the devel-opment of locomotive design. The diversity of opinion among designers, evidentfrom the irregular location of the points by which the. tube divided by diameter. In the case of compoundlocomotives, the volume of both cylinders is taken astwice the volume of the high pressure cylinder. Referring now to the curves, the heating surface isseen to have increased continually and in the years of,about, 98 and 99, would tend to rise more abruptly,due to the general increase in length of tube. This isborne out by the form of the curve, representing ratioof tube length to diameter at the points indicatingthese The introduction of the modified widefirebox was attended by a reduction in the fireboxheating surface as manifested by the abrupt change ofform and the total heating surface and firebox heatingsurface are seen to rise together, the former, however,rising above those of the older type of boiler havingthe narrow grate, while the firebox heating surface ac-companying a modified wide grate is, in many cases,as low as that of the narrow box in service ten years
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