COST OF MILL DETAILS. 431 



In estimating channel roof purlins classify 7 in. channels and smaller as one punched; 8 in. 

 cli.niii.-l-, .mil larger as two punched, unless they are shown or noted otherwise, and keep separate 

 from i idirr U-a ins. 



No extra charm- '" l " ' Ir a.l.li-d to curved beams for riveting, cutting to length, etc. 



Subdividing work into a larnt 1 nmnlH-r of classes should t>e avoided; it is better to have too 

 few classes, radicr than too many. 



Tin- only sulxliviMon necessary for cast iron columns are: I in. and over, and under I in. 

 Columns with ornamental work cast on must be kept separate. 



Round and Square Bars. In estimating round and square bars use the standard card for 

 rxt ras, Table III. It is not usual to enforce more than one-half the standard card extras for round 

 a n.l square bars. 



Extras. Shapes, Plates and Bars: 

 (Cutting to length) 



Under 3 ft. to 2 ft., inclusive 0.25 ct. per Ib. 



Under 2 ft, to l ft., inclusive 0.50 ct. per Ib. 



Under i ft 1.55 ct. per Ib. 



Extras Plates (Card of January 7, 1902): 



Base J in. thick, 100 in. wide and under, rectangular (see sketches). 



Per too Lb. 



Widths 100 in. to 1 10 in $ .05 



no in. to 115 in 10 



1 15 in. to 120 in 15 



120 in. to 125 in 25 



125 in. to 130 in 50 



Over 130 in l.oo 



Gages under J in. to and including & in 10 



Gages under r\ in. to and including No. 8 15 



Gages under No. 8 to and including No. 9 25 



Gages under No. 9 to and including No. 10 . . 30 



Gages under No. 10 to and including No. 12 40 



Complete circles 20 



Boiler and flange steel 10 



Marine and fire box 20 



Ordinary sketches 10 



(Except straight taper plates, varying not more than 4 in. in width at ends, narrowest end 

 not less than 30 in., which can be supplied at base prices.) 



TABLE III. 

 STANDARD CLASSIFICATION OF EXTRAS ON IRON AND STEEL BARS.* 



Rounds and Squares. 

 Squares up to 4$ inches only. Intermediate sizes take the next higher extra. 



Per 100 Lb. 



} to 3 in Rates. 



I to Ji ' $0.10 extra. 



to 



1 i 





and 



.20 

 .40 

 50 

 .70 

 i.oo 



2.00 



A , 2.50 



3rV to 3^ 15 



* This classification has been quite generally adopted, although several firms issue a special 

 card of extras. 



