( 59 ) [GUR 



Grinding Rest. A rest attached to a grinding machine for sup- 

 porting a tool while under the action of a grinding wheel. 



Grindstone (hand, foot or machine). A revolving stone used 

 for sharpening tools by abrasion. See " Grinding Machines." 



Groove. A long trench or hollow cut or ploughed by a tool, 

 mostly on one edge of a floor or lining board to receive the 

 " tongue " (which see) of another board. 



Grooving and Rebating Benches. Saw benches in which the 

 spindle has a rising and falling adjustment to facilitate the 

 operations of grooving, rebating, tenoning, etc. 



Grooving-plane. A joiner's instrument for making small grooves, 

 one of a pair of " tonguing and grooving planes," mostly 

 employed in making toiigued and grooved joints ; from the 

 tongues being produced to " match " or fit in the grooves 

 they are variantly termed " matched- joints " and the tools 

 " match-planes," hence " match " or " matched boards " 

 (which see). 



Ground-off Saws. Circular saws bevelled off on one side, and of 

 greater gauge at the centre than at the circumference. 

 Straight saws of greater gauge at the front than at the 

 back. 



Growing Timber. Timber trees are those which serve for build- 

 ding or reparation of houses (such as oak, ash or elm), and 

 are of the age of twenty years or upwards. Hedges, bushes , 

 willows, osiers, sallows and ornamental shrubs are not 

 timber, neither are trees which may become timber until 

 they are of twenty years' growth. 



Guaiacum. Another name for lignum vitse (which see). 



Gullet or Throat is the depth of a saw tooth from the point to 

 the root. 



Gum Trees. See " Satin Walnut." 



Gummer. A tool used to cut out the throats of a saw. 



Gumming. To grind out the throats of a saw. 



Gun Stocks. The " stock " or block from which the finished 

 article is evolved. Since the introduction of the gun the 

 chosen wood has been " European walnut," hence in war- 

 time the destruction of that class of tree has been enormous. 

 Beech, and other woods, especially American, have been 

 pressed into that service, but walnut has not been ousted. 



Gurjun (Dipterocarpus turbinatus). A dense hard Indian timber. 



