222 Agricultural Education. 



dowii on reaching the ground ? Woukl he necessarily fall if he were 

 to jump on a very smooth siu'face ? 



6. Give instances of the diiferent kinds of wedges. In what Avay 

 does friction assist the operation of splitting a piece of timber with a 

 wedge ? 



7. Describe a pidley, and explain the necessity of the sheave in a 

 pulley. 



Shew that a pulley may be employed to change the direction of a 

 power. 



A single moveable pulley is suspended from a beam outside of the 

 window of a loft, the two portions of the rope passing under the pulley 

 being parallel, and the free portion passing over a fixed pulley. A 

 man pulling the free end of the rope, and keeping it horizontal, walks 

 along the floor of the loft, and raises a weight of 200 lbs. through a 

 height of 15 feet ; find how far he walks, and the force he exerts. If 

 the weight of the rope be taken into account, state generally how the 

 force exerted by the man will be modified, and whether the roj)e can 

 be maintained in a horizontal position. 



8. Explain the advantage of a wheeled carriage over a sledge. Under 

 what circumstances would a sledge be of greater utility ? 



Explain also the advantages of high wheels, and describe the utility 

 of a " dished " wheel on a road which is imeven, or in which there are 

 deep ruts. 



9. Explain the xise of a "fly-wheel" in machinery, showing in 

 general terms that the power of its action depends on both its weight 

 and size. 



Having given the rate of rotation and the weight of the tire of the 

 wheel, what would be its tension '? 



10. A system of pulleys consists of two blocks, the upper one being 

 fixed, and the other moveable ; if there are three sheaves in each block, 

 find the power required to lift a weight of 1000 lbs. Show also through 

 Avhat space the power must be exerted in order to raise the weight 

 through 10 feet. 



11. Explain the construction and action of an "undershot wheel." 



12. Describe, in its simplest form, the construction and action of an 

 ordinary steam-engine. 



Describe the construction, action, and exact use of the " governor " 

 of a steam-engine. 



Friday, Decembee 15th, 1865; 2 p.m. to 41 p.m. 



MECHANICS APPLIILD TO AGRICULTUEE. 



1. A field-gate, 9 feet 6 inches long, is hung by two hooks to a 230st, 

 which is sunk 3 feet 3 inches into the ground ; the bottom hook is 

 11 inches, and the upper hook 3 feet 7 inches above the ground ; the 

 gate weighs 136 lbs., and its centre of gravity is found to be situated 

 2 feet 8 inches above the ground, and 4 feet from the line of centres of 

 the hooks. 



