14 



HAND AND OTHEB APl'ARATOS. 



length as the beam, are fastened, and divided into 

 three parts, the same way as the beam. These not 

 only prevent anything placed on the stand from 

 rolling or being- knocked off, but if divided into 

 inches and half inches, enable the apparatus to be 

 placed in any position they may have formerly 

 occupied on the stand. 



Parts 1 and 2 are joined together on their under 

 surface by two strong hinges, let in flush with the 

 wood. 2 and 3 are joined on their upper surface, in 

 the same way where the laths meet as in fig. 23. 



Along the sides of the beams ten bolts are inserted 

 projecting one inch and a quarter from the surface, 

 and six inches distant from each other. Their proper 

 position is best determined by first fixing two, three 

 inches on each side of the centre of plank no. 2, or 

 three inches from where it joins 1 and 3 ; then in- 

 serting the remaining eight ten inches from these 

 and from each other at four equal distances on planks 

 1 and 3. This description will be easily understood 

 by a reference to the figure. 



A board three feet long, two and a half inches 

 wide, and one inch thick, B fig. 23, has six holes 

 drilled in it, six inches apart, the last holes on either 

 side being three inches from its extremities. This 

 enables it to be screwed on to anv six bolts at the 

 same time, thus keeping the several parts of the 

 beam steady, in the various positions we are com- 

 pelled to place it, owing to the different methods 

 adopted to meet the requirements of every case. 



The first division of the beam I, fig. 23, is in- 



