MOTION, MECHANICS, ETC. 



151 



plane, wheel and axis, wedge and screw, are the same as 

 described in the preceding set. 



Price, complete with inclined plane, wedge, 



screw, and brass weights, 816.00. 



Fig. 159. 



Improved Set of Mechanic Powers. (See Fig. 159, as 

 above.) In this elegant set of mechanic powers, there are 

 five arrangements, or systems of pulleys ; others may be 

 made by altering the cords. On the top of the frame there 

 is mounted a wheel and axis, the axis being one inch in 

 diameter, and there being three different diameters to the 



