Recent Log Rules. 145 



mills were measured, followed through the mill, and the product 

 ascertained. The results were tabulated in the form of a log rule 

 which has recently been published in "Forest Mensuration of the 

 White Pine in Massachusetts" by Harold O. Cook, Boston. The 

 Massachusetts log rule is supposed to show the actual product in 

 inch boards which the average portable mill can produce from 

 white pine under the present conditions in Massachusetts. It has 

 been tested at nearly 200 mills and gives satisfaction. 



Clement's Log Rule. This rule was designed by Charles J. 

 Clement, of Portland, Oregon. It was published in 1904 in a 

 small pocket booklet entitled "Clement's Rule and Table for the 

 Measurement of Logs." It only recently came to the writer's 

 attention and was not noted in "Forest Mensuration." The claim 

 is made that it is the only rule which gives the exact amount of 

 board measure, etc., a statement which prejudices one against it 

 at the outset. The rule is as follows : Multiply half the diameter 

 by half the circumference, then subtract half the circumference, 

 the remainder will be the total amount of feet, board measure, 

 in a 16 foot log. Or if the circumference is unknown, multiply 

 the diameter by 3. 141 6, then divide the product by two and multi- 

 ply by half the diameter and subtract as above mentioned. If the 

 log is more or less than 16 feet, divide the amount of feet by 

 16, then multiply this remainder by the number of feet in the 

 length of the log. 



Click's Log Rule. This rule has been devised by Mr. A. G. 

 Click, of Elkin, N. C. The general rule is as follows : From the 

 square of the diameter deduct two and a half diameters and mul- 

 tiply the remainder by one-half the length of the log and cut off 

 the right hand figure. 



Calcasieu Standard Log Rule. This table is based on the fol- 

 lowing rule of thumb ; Multiply diameter by diameter, that pro- 

 duct by length, divide by 32, and add one one-hundredth. 



As seen in the comparison table below the results are absurdly 

 small for large logs. This rule is published by Irvine & Irvine, 

 725 Ryan St., Lake Charles, La. 



