Siemens . 
PLAN. 
Phil. Trans. 1876 . Plate 64 . 
ELEVATION. 
A. Tube, containing Mercury. 
B . ControCcted, Orifice. 
C . Diaphragm, . 
D. Springs. 
F . Adjustment screws . 
F . Cross piece. 
G Contacts. 
H. Ebonite supports. 
I. Horse shoe spring . 
J . Micrometer with Vernier. 
K. -Rod/ and/ Pinion, . 
L . De la. Rue or Nitrate of Mercury Element. 
M. Gabrouio meter . 
SECTION X. Y. 
W-West^C? Ktk. 
