54 



Scientific Proceedinc/s, Ro//al Dublin Society. 



Fig. 2 shows the arrangement. T is an H -shaped piece of tinned iron 

 about 5'5 cm. long. The cross-piece of the H is represented by a broad 

 band about 3 cm. wide. It is covered by a piece of thin cardboard C about 

 1'2 cm. X 5 cm. This card carries three stitches of the ends of tlie leads on 

 each side of its middle line. The ends of the card are folded round the 

 cross-piece of the H and the iron is folded in the middle along the dotted 

 line (fig. '2 A), so that the ends of the card are nipped within the fold. Then 

 the four ends of the H are bent out at right-angles to folded middle-piece, so 

 as to form a stand to support the folded card in a vertical position (fig. 2 B). 

 To prevent the ends of the leads making contact with the iron, two little 

 plates of mica {M, fig. 2 B) are slipped between the leads and the iron— one 

 on each side of the vertical portion. The mica plates are held in position by 

 the cardboard. 



B 



Fig. 2. — A. Tinned iron support Tand card C carrying the ends of the thermo-conple leads before 

 folding. 

 B. Side view of support T after folding. M plate of mica insulating bare end of lead from 

 support. 



Connection between the ends of the leads exposed on this support and 

 those coming from the galvanometer was made in the following way : — The 

 bare ends of the galvanometer leads were fixed on the inner surfaces of the 

 jaws of a spring wooden clip. When the clip was closed upon the vertical 



