DESCRIPTION AND SKETCHES OF LEVER APPLIANCE. 



191 



or four others go as near as possible to the free end of the lever, 

 and push it round to the position shown in Fig. 3, when it will 

 be seen that hook E has pulled in the chain a little way, while 

 hook D can be put into another link a little farther up. The 

 lever is then brought back to the position shown in Fig. 2, 

 during which movement hook D pulls in the chain, while hook E 

 is released and put still farther up (Fig. 4). And so the pulling 

 goes on, hand over hand style, every movement showing a hook 

 pulling and a hook being released for a fresh hold; and it is 

 astonishing what weights can be thus moved. 



Fig.4 



This estate is bounded on the east by a river about 15 yards 

 wide, and on the west bank there are a number of heavy poplars, 

 growing very close to the edge of the bank, and about 8 feet 

 above the summer-level of the water. These trees are over-ripe, 

 and have the heavy eastward list so common to this species, so 

 much so that a perpendicular line from some of their tops would 

 touch the water about 8 yards from their butts. They average 

 100 feet in height, and this appliance has been of very great 

 service in bringing them round clear of the water during the 

 process of felling, and also in pulling out of the water a number of 

 them which had been blown down. Last spring I was asked to 

 take down a few of those standing closest to the river and leaning 

 the most ; and of thirteen trees selected, twelve were safely landed 

 well on to the meadow without touching the water. The thirteenth 



