TWI] ( 150 ) 



Trussed Beam. A compound beam, composed of two beams, 

 secured together side by side with a truss, generally of iron, 

 between them. 



Trying-up Machines. Machines used for trueing up warped and 

 twisted timbers. Consisting of an adzing block revolving at 

 high speed, and a travelling table to which the work is 

 securely cramped. The table is made to travel backwards 

 and forwards under the block by self-acting gear. 



Tucking and Tuck-pointing. The sense of this is a " push-action," 

 as in tucking up a bed. It is here plaster or fine putty 

 "tucked" into a "raked-out" or "gaping" joint. See 

 " Pointing " and " Hick- joint Pointing." 



Tulip Tree (Liriodendron tulipifera). An American tree, whose 

 flowers resemble the tulip ; it produces the yellow poplar 

 wood of commerce. 



Tulip Wood (Physocalymma scaberrimum). This high-class fancy 

 wood obtains its name from its roe figure, red and dia- 

 gonal, or yellow, which resembles the tulip in flower, dis- 

 playing its striped colours. As a wood, used for banding and 

 inlaying, it is somewhat at a discount, inasmuch as the bright 

 colours are wont to fade. 



Tult (or dozen). A Norwegian measure consisting of 12 logs of 

 18 ft. in length, or 216 running ft. 



Tupelo or Tupelo Gum (Nyssa aquatica). This tree is a member 

 of the dogwood family. It grows in the Southern States of 

 U.S.A. The wood resembles yellow poplar in colour and 

 general appearance, and often passes for that wood. In the 

 American market it is known as " Bay poplar." 



Turkey Oak or Adriatic Oak (Q. cerris). A tree common in 

 south-east Europe as well as in Asia, but not one whose wood 

 figures generally in commerce. Its bark and fruit are rich in 

 tanning qualities. 



Turner (of wood, iron, etc.). One who turns substances in a lathe. 

 It is fairly clear that these operatives worked with " recipro- 

 cating-lathes " till about the middle of the eighteenth century, 

 when they were practically replaced by the rotary foot-lathe, 

 which held the field for fully a century ; the " treadle " in 

 both cases was mainly a long pole, one end resting on the 

 floor, the other in a rising and falling state from the pressure 

 of one foot of the operator. See " Lathe." 



Tushing. See " Snigging." 



Twisted Fibre. A defect in timber caused by the fibre or thread- 

 like portion of the tissue being deposited in a twisted form. 



