472 Forestry Quarterly 



fiber brushes, 12" long, the brush part being 3" long and "'/»" 

 in diameter at the bottom and V2" in diameter at the top. The 

 brushes are stained green and the double wired part that gives 

 them support is made brown. 



To make the forest floor look real, a special board is prepared 

 through which 670 holes are made. The board is painted greyish 

 brown and to anyone who looks at the model at close range the 

 growth of these trees through this perforated board is most inter- 

 esting. 



While the model is only 7' 2" x 19" x 14", resembling a long 

 box, we have made it look very much bigger by building a little 

 sawmill in the middle and a sort of scaffold all around the model. 

 Covering this scaffold is a large piece of green cloth which after 

 encircling the model box is allowed to come down to the floor. 

 The green cloth gives the appearance of a meadow and on it we 

 have put little wooden houses, pagodas, wheel-barrows with pas- 

 sengers, bridges, etc., and painted roads, and canals, making the 

 place look like a Chinese village. 



A description of the machinery which actuates the rise and fall 

 of these ten areas might be of interest. Beneath each plate which 

 holds the area of trees is an X-shaped frame composed of two 

 V2-inch-wide strips of band iron with a rotating joint at the center. 

 One of the lower ends of this X-shaped frame is fastened with a 

 pin to the bottom of the box. The other leg is free to travel back 

 and forth in a slide way under the pull of a small wire rope. When 

 this rope is piilled, the two lower legs of the frame are drawn 

 together and the plate is made to rise pushing up the trees through 

 the holes in the top board. This wire rope winds around a grooved 

 pulley. 



To secure portability the long 7-foot box is divided in two, 

 connected with hinges so that it can be folded together with the 

 trees inside. This division necessitates dividing the operating 

 mechanism so that half the pulleys are permanently on one side 

 of the model and half with their stands on the other side. On 

 each side of the center, therefore, five grooved pulleys are mounted 

 on a shaft and the two shafts are connected by 6-inch gear wheels. 

 When the outside handle attached to one of these shafts is turned, 

 it rotates its own shaft directly and the other through the gears 

 and their pulleys with them, and thus the wire is pulled in and the 

 plates with the forest sections made to rise. 



