— 210 — 
Eye bars 
No. 
Thickness 
Depth 
Depths of heads 
Length centre to 
centre of eyes 
Extreme length 
Adjustable 
rods with 
plain eyes 
No. 
Diameter. 
Short Piece. 
Long Piece. 
Rod 
Upset 
end 
Diame- 
ter of 
eye 
Length 
of 
loop 
Length, 
centre of 
eye to end 
Diame- 
ter of 
eye 
Length 
of 
loop 
Length, 
centre of 
eye to end 
Adjustable rods 
with bent eyes 
No. 
Diameter. 
Short Piece. 
Long Piece. 
Rod 
Upset 
end 
Diameter 
of eye 
Length, centre 
of bend to end 
Diameter 
of eye 
Length, ceutre 
of bend to end 
Diameter. 
Pins 
No. 
Body 
Beilnced 
ends 
LeDgth between shoulders 
Extreme length 
Rollers 
No. 
Length between shoulders 
Extreme length 
Any details winch will not go into one of these groups will be made of material 
that the manufacturer keeps in stock ; for instance, fillers, washers, nuts, turn 
buckles, sleeve nuts, ornamental work, name plates &c. 
Pins sliould bo ordered an eighth of an inch greater in diameter than required 
in the bridge, so that they may bo turned down, and shoe plates and roller plates 
one sixteenth of an inch thicker so as to allow for planing. 
Spilces are generally purchased separately from special dealers. 
Lumber is, of course, bonglit separately ； it should be ordered in the following 
form. 
No. Pieces 
Thickness 
Width 
Length 
Kiud of Wood 
After the working drawing is finished there should be prepared to accompany 
fi final order bill in which are to be groape l all similtu* pieces and all their detn-il^ 
which are attached to them in the shop. 
The following grouping will coyer any case of an ordinary iron railroad bn^ e 
designed according to the method of this treatise. 
