44 THE CAMERA, ETC. 



years' experience, during which time scarcely a 

 month elapsed without the trial of some fresh device. 

 It is still far from perfect, but we hope, its simplicity 

 will in some degree atone for its numerous defects. 



A beam ten inches wide, two inches thick and six 

 feet long, is sawn into three separate portions, three, 

 one, and two feet long respectively (see figs. 2 1 and 

 26). On the upper surface at each side flush with 

 the edges, two laths one inch wide, half an inch 

 thick, and the same length as the beam, are 

 fastened, and divided into three parts, the same 

 way as the beam. These not only prevent any- 

 thing 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 8 are joined on their upper surface, in 

 the same way where the laths meet as in fig. 24. 



Along the sides of the beams ten bolts are iiife jrted, 

 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. 



