. Maître mécanicien de chemin de fer [microforme] . exprimé comme surface de chauffage totale = 205 vt., où vt.= volume des deux bouteilles en cu. Ft. Dans la mesure où les principales caractéristiques d'intérêt incarnéesdans cette conception sont apparentes dans la chaudière, nous accompagnons la gravure en demi-teinte de la locomotive par des dessins de la chaudière uniquement. La considération de cette conception montre un effort pour assurer la libre circulation de l'eau et de toréduction de la surface de chauffage du tube, une surface à laquelle trop de muchvalue a été attaché dans de nombreux cas. Le tableau suivant présente les dimensions principales des nouvelles locomotives : jauge 4 ft. 8 y2 po CY

• Contributeur: Reading Room 2020
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. Railway master mechanic [microform] . expressed as total heating surface = 205 vt., where vt.= volume of both cylinders in cu. ft. Inasmuch as the principal features of interest embodiedin this design are apparent in the boiler, we accompanythe halftone engraving of the locomotive by drawings ofthe boiler only. Consideration of this design shows aneffort to provide for free circulation of water and toreduce tube heating surface, a surface to which too muchvalue has been attached in many cases. The following table presents the principal dimensionsof the new locomotives: Gage 4 ft. 8y2 ins. Cylinder 22x28 ins. Valve Balanced Boiler. Type Straight Material Steel Diameter 70 ins. Thickness of sheets 11-16 in. Working pressure 200 lbs. Fuel Soft coal Staying Crown bars Firebox. Material Steel Length 180 ins. Width 66 ins. Depth front 68 ins. Depth back 64 ins. Thickness of sheets, sides % in. Thickness of sheets, back % in. Thickness of sheets, crown % in. Thickness of sheets, tube % in. Water Space. Front 5 ins. Sides 5 ins.. C. & A. Locomotive—Cross Section of Firebox. Back 5 ins. Tubes. Material Iron Wire gauge 0.125 M. M. Number 245 Diameter 2% ins. Length 20 ft. Heating Surface. Firebox 179 sq. ft. Combustion chamber Tubes 2, 874 sq. ft. Firebrick tubes Total 3, 053 sq. ft. Grate area 49.5 sq. ft. Driving Wheels. Diameter of outside 77 ins. Diameter of inside 70 ins. Journals, main 10x12 ins. Journals, others 9x12 ins. Engine Truck Wheels. Front, diameter 33% ins. Journals 6xl0~ ins. Back, diameter 45 ins. Journals 8x12 ins. Wheel Base. Driving 13 ft. 4 ins. Rigid 13 ft. 4 ins. Total engine 33 ft. 4 ins: Total engine and tender 62 ft. 8% ins. Weight. On driving wheels 135, 110 lbs. On truck, front 40, 500 lbs. On truck, back . 45, 940 lbs. Total engine 221, 550 lbs. Total engine and tender, about 376, 000 lbs. Tender. Wheels, No 8 Wheels, diameter 36 ins. Journals 5^x10 ins. Tank capacity 8, 400 gals.

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