505
OF ENGINEERING F0RMULÆ.
Locomotives (French Practice;—coniinueu.
Height from fire-grate to lowest
tow of tubes ....................= 08 VII.
..............
Internal diameter of tubes.. .. — 1J to If in.
TT
Number of tubes..............= -0033____
2 d
Length of tubes..............= 87 d.
Thickness of metal in tubes .. = 14 B.W.G.
Heating surface in fire-box .. = -08 H.
Ditto in tubes ..............= • 92 H.
Total.......................- H.
Total tube area..............= -00269 H.
Width of fire-box water-space .. = 3| ins.
Distance of fire-box stay-bolts
apart.......................= 4 ins.
Diameter of stay-bolts .. .. = | in.
Inside diameter of boiler .. .. = • 124 Vil.
Length of boiler..............— • 84 d.
Thickness of boiler-plate .. .. = *0013 VH.
Ditto outer fire-box plate .. .. = • 0014 V H.
Ditto tube-plate (fire-box end) .. = • 0024 V H.
Area of one safety-valve .. .. = -0001 H.
Diameter of pump-plunger .. = • 0028 V H.
Stroke of ditto ...............— inches.
Diameter of clack-valve opening = • 0058 V H,
Ditto suction-pipe __________= '0058 V H.
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