LOCOMOTIVE ENGINES.
739
Steel of Vickers’, Cammell's, Taylor's, or other approved make; the bogiehorn blocks to be fitted with cast-iron distance blocks and securing bolts asshown. The driving and trailing horn blocks to be solid, and providedwith adjustable wedges and securing bolts. The horn blocks must beaccurately bedded to the frames, and secured by turned bolts a driving fit.The horn stays to be of wrought iron; care must be taken that they fit thehorn blocks accurately.
Axles .—To be of crucible cast Steel of Vickers, Sons, & Co.’s extra make;the webs of crank axle to be hooped; all corresponding parts to be of anexact size and made to template, so that they may be interchangeable, andeach axle must be clearly stamped with the maker’s name, and the brandextra. The Journals are on no account to be swaged down, but in all casesturned from the solid. The wheel seats must be accurately turned to a taperof i in ioo.
Diniensions.
Bogie Axles.
ft.
in.
Diameter in middle ...
... 0
,, on wheel seats ...
0
VÄ
„ ofjournals
0
6
Length ,, ... ... .
... 0
9
Distance apart of centres of Journals
3
7
Crank Axle.
Diameter in middle ...
... 0
7
,, on wheel seats
... 0
9
,, ofjournals
0
7%
Length ,,
0
7'Ä
Diameter of crank-pin journals
... 0
7ti
Distance apart of centres of cranks
2
4
Do., journals
4
O
( 12 in. by 4.3/ in. )
Cross sections of crank arms X .
_
_
( and. 12 in. by 4 y z m. 1
Throw of cranks
0
!3
Trailing Axle.
Diameter in middle ...
... 0
7
,, on wheel seats
.. 0
9
,, ofjournals
0
7 l Ä
Length ,, .
0
rA
Distance apart of centres of journals
4
0
Wheels .—To be of wrought iron, of the best materials and workmanship,with solid rims, spokes, bosses, and balance weights. The spokes must beforged with solid T ends, and welded in the centre. The surfaces of rimsand spokes to be shaped so that the wheels are exactly balanced. Eachwheel is to be bored taper and put on the axle, before the tyres are shrunkon, by hydraulic pressure of not less than 60 tons, and then properly keyedon. Great care must be taken that the keys fit accurately.