MODERN STEAM PRACTICE.
/3“
in a horizontal position just below top of blast pipe. Care must be takenthat this grate fits accurately round the steam and blast pipes.
Dimensions.
ft.
in.
Length of smoke box, inside ...
2
8/4
Width on centre line of boiler, inside
4
II
Thickness of plates
o
o H
Section of angle iron ... ... 2% in.
by z'/z in.
by
Yz in....
—
—
,, ring round door hole
3 in.
by
—
—
Diameter of rivets
o
o H
Pitch of rivets, about ...
o
3
Chhmiey. —To be of BB Staffordshire iron; joint to be made with a buttStrip, and the rivets to be countersunk, and filed smooth on the outside.The bottom, of best Yorkshire iron, to be quite free from hammer marks,and to be carefully fitted to smoke box. The top, of cast iron, to be madeto drawing.
Dimensions.
ft.
Height of top of chimney from rail ... ... ... ... ...13 Z 7 Ä
Diameter inside at top... ... ... ... ... ... ... 1 6
,, ,, bottom ... ... ... ... ... ... 1 5
Thickness of plates ... ... ... ... ... ... ... o 0%
Ash Pan. —To be made to hold water; to be fitted with a damper, frontand back, each to be worked separately from the footplate; the damper rodsto be on the right-hand side of footplate.
Dimensions.
ft. in.
Thickness of plates of ash-pan .o o T \
Depth of ash-pan ... ... ... ... ... ... ... i 2
Width.3 4
Safety Valves .—To be of the kind known as “ Ramsbottom’s duplex”safety valves, to be fixed on the fire-box casing. The columns to be otbrass turned bright, fixed on a cast-iron manhole cover. The springs (ofapproved manufacture) and gear to be made accurately to drawing, and setso as to blow off at 140 lbs. per square inch. The seating to be of wroughtiron, carefully fitted to the fire-box casing. All the joints must be accur-ately faced, so as to be perfectly steam-tight.
Dimensions.
ZÄ
IOtS
OM
Diameter of valvesDistance apart of columnsHeight of brass columnsDiameter of spring Steel
,, manhole coverThickness of seat
Regulator and Steam Pipes .—Regulator to be of cast iron, the head to befitted with double valves. The steam pipes to be of copper sheets hard