HAND AND OTHER APPARATUS. 51 



the waste pipe is attached, which should pass out- 

 side both apartments if possible. 



The top should be levelled and a sliding frame- 

 work, or a board with holes placed upon it, as in 

 (fig. 22). If no better water supply can be obtained 

 a barrel capable of holding a sufficient quantity and 

 having a brass rose cock near the bottom, may be 

 fixed on a stand, about three or four inches higher 

 than the trough and on its left hand side. 



Some shelves to hold stock solution, etc., are 

 placed against the wall opposite to the window, a 

 small shelf being fastened above and below the 

 window itself to bold the bottles and dishes in 

 actual use. 



On the right hand side of the trough a square box 

 is fixed just deep enough, to allow the flame of a 

 lamp, with a chimney of ruby glass, to appear above 

 it. 



The best method of preventing any actinic light 

 from the lamp reaching the sensitive plates, is to cut 

 two holes in a large American meat tin, one on a 

 level with the flame, the other in the top. In the 

 latter a crooked chimney, the same as is used for a 

 magic lantern, is inserted; and in the former a piece 

 of ruby glass. The whole is placed over the lamp 

 in the box, (the sides of the tin near the bottom 

 having a few holes previously made in them, to allow 

 of the free entrance of air). 



One or two cupboards are useful, they should be 

 large enough to hold tin boxes for plates, sensitive 

 tissue, etc. 



e2 



