LUMBERING m PINE EEGIOlsr OE CALIFOKlsriA. 71 



SINGLE-BAND MILLS. 



The principal advantages of a band mill are the small saw kerf 

 and high speed in sawing. The investment is larger than for a circular 

 miU and the daily output must be greater. This calls for heavier 

 and better equipment aU through the mill. 



Single-band mills are well adapted to medium-sized logging chances 

 and have many advantages over both smaller and larger miUs. 

 The initial investment is not too great for an operator of moderate 

 means ; and the operation lends itself peculiarly well to management 

 by one man. Thus, in many instances it is the most desirable 

 mill for operating ui National Forest timber. Because of certain dis- 

 advantages m operation and upkeep, the sawing cost is frequently 

 a Httle higher than for a double-band mill. Where the output of a 

 smgie-band mill in 10 hours will not warrant the required investment 

 in loggmg facihties and stumpage, it is often better to work a day 

 and a night shift than to construct a double-band miU. The dis- 

 advantage of workmg double shift is that little time is left for mill 

 inspection and repans. 



Although similar in type, single-band mills throughout the region 

 vary in details and thoroughness of construction, according to the 

 length of time they are to be used and whether they are to be operated 

 for one or two shifts daily. The mitial cost varies from $35,000 to 

 $75,000, exclusive of pond and yard. The 10-hour output likewise 

 ranges from 50,000 to 65,000. The output for a mill operating 

 double shift is from 110,000 to 120,000 per day. 



The equipment varies in the same way as the construction; that is, 

 heavier equipment is used in the mills intended for operating double 

 shifts or producing the maximum daily output. The sawing equip- 

 ment of a representative mill consists of the foUowmg articles: 



1 log jacker. 



1 log kicker. 



1 log stop and loader. 



1 steam log turner. 



1 8-foot or 9-foot Vjand mill, either right or 

 left. 



1 carriage, with either two or three head- 

 blocks. 



Steam or power HOt work.s for carriage. 



Steam or calde feed works for carriage. 



1 series live rolls. 

 1 60-inch gang edger. 

 1 lumber transfer to trimmer. 

 I slash transfer. 

 1 overhead slasher. 

 1 gang trimmer. 

 I lumber-sorting transfer. 

 I chain refuse conveyor. 

 i''iliiig room, etiuippcd for filing band and 

 circular saws. 



The mill budding is commonly of two-story frame construction, 35 

 or 40 feet in width by 120 f(!(',t in l(;nglh. The roof is often made of 

 corrugat(!d iron inst(!ad of shingles or boards. The boUers are placed 

 in an adjoining boiler house, which may be of wood, corrugated iron, 

 or hrifk, dcjxjnding upon the pcu-nianence of the mill. The eiighie 

 room Is usually underiHiulh the mill door. A satisfactory power |)laiit 

 consists of a 16 ])y 36 inch engine and two 60-inch hy 16-f()<)t boilers, 

 the aggregate development Ixiing from 250 to '.'AH) horsepower-. 



