Agricultural Education. 223 



Eequired tlic order of lever of tlie whole combiuation, position of 

 the points of power, fulcrum and resistance, and the stress in lbs. 

 upon each of those points. Also fiud the stress in lbs. upon each of 

 the two hooks. 



2. A set of " whipplc-trees " are so arranged that the " double tree " 

 is 4 feet long, and it requires to be divided in such a manner that it 

 may be suitable for two horses, whose strengths are to each other as 

 7 is to 5. 



Eequired the position of the hook in the " double tree.'' 



3. The shovel used in some parts of England is formed something 

 like the " ace of spades," and has a long handle, the whole being 

 arranged so that the worlvman has no occasion to stoop in using it. 

 In these respects the shovel differs from those used in other parts of 

 England, where the cutting edge of such shovels in use is parallel with 

 the ground ; and, the handles being short, the workmen have to stoop 

 much in using them. 



State your opinion, and the reasons for that opinion, as to which 

 of the two kinds of shovel you consider the best, taking into con- 

 sideration the various purjjoses for which shovels are used in the 

 farmer's business. 



4. A timber-gin having three horses attached to it is stuck fast in a 

 wood. Each of the three horses is capable of exerting a force equal 

 to 1000 lbs. ; but they fail to move the gin. Two of the horses are 

 then removed from the pole, and are hooked by chains to the extreme 

 upper part of the wheels of the gin, one on each side. The horses are 

 now put to work, exerting the same force as before, and are now just 

 enabled to move the gin. 



Eequired the amount of the resistance in lbs. of the gin at that time. 



5. There is a common windlass, consisting of a rope, a barrel or 

 axle and handle, placed over a well ; the circumference of the rojje is 

 3 inches, the radius of the axle or barrel is 3 inches, the length of the 

 handle is 2 feet, and a power of 50 lbs. is applied to the handle. 



Eequired the weight which would be raised, were there no friction. 



6. A threshing-machine is worked by six horses walking in a track 

 23 feet in diameter. The machinery for giving speed to the " di-um," 

 or " beaters," consists of thi-ee wheels. A, B, C, which work into and 

 drive three pinions, E, F, G, respectively. The wheel A carries 192 

 teeth, B 118 teeth, and C 58 teeth; the j)iniou E carries 16 teeth, F 

 13 teeth, and G 17 teeth. The wheel A makes the same number of 

 revolutions as the horses do, and the pinion G is carried by the drum- 

 spindle, rotating 1018 revolutions per minute. 



Eequired the speed at which the horses must travel, in miles per 

 hour, in order that the drum may make the stated number of 1018 

 revolutions per minute. 



7. The drum of a threshing-machine makes 1000 revolutions per 

 minute ; its diameter is 22 inches, and the weight of one of its beaters 

 is 17J lbs, 



Eequired the force in lbs. necessary to hold the beater in its position 

 on the driim. 



