BOOM AREAS. 



P>v Augustus M. Carter. 

 Surveyor for the Berlin Mills Company, N. H. 



A number of tables were made on the basis of actual trials for 

 the purpose of ascertaining the number of pieces of timber of 

 various lengths and diameters, and the amount of board feet 

 contained hi them, which can be floated within a given area of still 

 water, under the premise that they are forced together by the 

 current of a river, or by the tension of towing upon a lake, into a 

 compact body, but not hard enough to submerge any individual 

 stick. 



The tables also show the number of lineal feet of boom sticks 

 necessary to surround a certain number of thousands of board 

 feet. In the case of chain booms a distance of one foot for play 

 is allowed between sticks, and should be added to the length of 

 each stick to arrive at the theoretical circumference. 



The logs in these tables were measured by the Blodgett Caliper 

 rule, and show the number of feet which this rule gives. The 

 conclusions arrived at, which have been figured out into board 

 feet, are on the basis of 115 cubic feet of the Blodgett Caliper 

 Rule equaling 1,000 board feet. 



A general table containing logs of all sizes, from 5 inch to 20 

 inch middle diameter and 6 to 44 feet in lengths gives the area 

 which each of the logs occupies in cubic feet and in Blodgett 

 feet. From this, by selection, other tables containing given sizes 

 can be constructed, giving reasonably accurately the water area 

 covered by the logs. 



The following is a resume of the General Table, and is suffi- 

 cient to show the method of procedure and results : 



