142 A MANUAL FOR NORTHERN WOODSMEN 
logs of different sizes, though in a run of logs the results 
obtained may approximate a fair thing. Very small values 
are given to small logs, too small by far for normal logs 
economically manufactured, while beyond about 36 inches 
in diameter values are given that are above the product of 
the saw. It crosses the Scribner rule at 25 inches in 
diameter, the Maine rule at 34. A test made by Dr. J. F. 
Clark in 1905 in a Canadian band mill cutting sound, 
straight pine into boards resulted as shown on page 141. 
The Doyle rule is in more general use than any other in 
the United States and Canada, and is the one printed in 
recent editions of Scribner’s “ Lumber and Log Book.” 
This rule has been combined with the Scribner into the 
Doyle-Scribner rule, the figures of the Doyle rule being 
taken for small logs where the Doyle figures are lower, 
and of the Scribner rule on the largest logs where these 
figures are less. This Doyle-Scribner rule has been used 
largely on hard woods. * 
5. Maine, also called Holland Rule. The figures of this 
rule were derived from diagrams. That is to say, circles 
6, 7, 8, etc. inches in diameter were plotted and within 
these the boards that could be sawed, an inch thick with 
J inch for saw kerf. Not only the boards derived from the 
inscribed square were reckoned, but the side boards if 
they were as much as 6 inches wide. No rounding off of 
the figures was done, so they are a little irregular, but that 
takes care of itself in a run of logs. 
This rule is used largely in Maine and to some extent 
elsewhere. It has been carefully tested at the saw, and 
the conclusions are as follows: — Sound spruce and pine 
logs 12 to 18 feet long, of best merchantable quality, 
manufactured at a circular saw cutting f-inch kerf will 
yield in the shape of inch boards just about the number of 
feet of edged lumber that the rule gives. A band saw will 
get more, and there will be a larger product if the logs are 
put into plank or timber. More will also be got the longer 
the logs run, up to the point where they are scaled in two 
pieces. 
How sawing practice affects the product at the saw was 
clearly shown by a test made by the United States Forest 
