CELLS AND MANOMETER ATTACHMENTS. 



19 



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Fig. 7. — First form of complete cell. 

 (A) Porous cell; (B) glass tube; (O manometer; 

 (a) groove cut in cell; (6) soapstone ring; 

 (c) and (d) enlargements in glass tube, to pre- 

 vent slipping; (e) contraction at upper end of 

 glass tube; (/) and (n) litharge-glycerine 

 cement; (g) brass collar; (h) brass nut; (i) 

 concave brass piece ; (j) enlargement on end 

 of manometer; (A;) rubber stopper; (0 cork; 

 (m) glass bottle; (o) brass piece. 



Fig. 9. — Second form of complete cell. 

 (1) Brass collar; (2) brass nut; (3) lead 

 washer; (4) orasscone; (5) manometer; 

 (6) hollow needle; (7) fusible metal; 

 (8) brass piece to which the needle 

 is brazed; (9) steel screw threaded into 

 (8); (10) packing; (11) fusible metal 

 covering exposed part of needle; (12) 

 rubber tubing; (13) and (14) windings 

 with twisted shoemakers' thread. 



