( 15 ) [BOL 



surface measurement is still only 12 sq. ft. In Holland, 

 in the days of Dutch wainscot, the standard board was 

 12ft. x 11 Jin. x 1 in. This " 12 ft." became the standard 

 of dimensions generally. 



Board Rule. An implement universally used in America for 

 readily ascertaining the superficial area of boards. It has 

 been adopted in this country for the measurement of Ameri- 

 can boards or lumber. It is 3 ft. in length, and consists of 

 a flat flexible metal-tipped rod usually made of hickory, oil 

 the flat surface and edges of which are marked the figures by 

 which the superficial area of the boards is ascertained. 



Boathook Shafts. Called also " Quants." Tapered handles, 14 to 

 24 ft. in length, according to length of boat-hook. This term 

 is often shortened to " boathook " ; for instance, " poles, 

 rickers and boathooks, graded according to size." 



Boat Skin. Thin boarding used for boat-building. 



Bobbin or Bobbins. A small flange or head-ended piece of wood 

 on which thread or silk is wound, usually bored through to 

 receive a pivot or spindle. A variant term for this useful 

 instrument is " spool." See " Bobbin Wood." 



Bobbin Sandpapering Machine. This tool is useful for smoothing 

 curved and irregular work. The sandpaper is strained round 

 a small cylinder of wood, or, if very small, the wood is coated 

 with abrasive material. The cylinder is fitted to a revolving 

 spindle provided with a reciprocating motion to prevent 

 scratchy marks on the wood. 



Bobbin Squares. See " Bobbin Wood." 



Bobbin Wood. A close-grown class of soft or semi-hard wood, 

 non-resiiious in character, suitable for making what is 

 popularly called " cotton-bobbins." Although small articles 

 given away with the thread, they form in the aggregate an 

 important factor in the home and foreign timber trades. 

 The most popular woods are birch, alder and ash, of small or 

 medium diameter, cut into lengths called " props." The 

 first form of conversion is into " bobbin squares." 



Bois d'arc. See "Osage Orange." 



Bois-Durci. A French invention for utilizing the sawdust of hard 

 woods, such as rosewood, ebony, etc. After the sawdust is 

 reduced to fine powder, it is mixed with blood into a paste ; 

 other materials are added, and when pressed into moulds it 

 receives the most beautiful impression. Used for medallions, 

 etc. 



Bole. The trunk or stem of a tree, after it has attained the 

 diameter of 8 in., which constitutes timber. 



