16 Journal of the Asiatic Society of Bengal. [N.S., XVI, 
to sagen me level of the sulphuric acid contained in the funnel 
(H) insi 
is an iron ring, soldered on the case with its ear 
immediately over the funnel. Through Aetna heey 
ordinarily kept closed and air-tight by an iron co Q) dip. 
ping in a mercury and oil groove, fresh sulphut acid can be 
introduced into the funnel whenever nece 
"he lower portion (C) of the inir, case carries the 
saat tn fittings :-— 
H) A glass funnel, provided with a tap underneath the 
base. This funnel passes through a hole (J) and is sealed air- 
tight with pitch composition. 
n order to make room for the acid funnel, the electro- 
meter is not placed symmetrically inside the outer case. Its 
levelling screws rest on brass brackets (K) 120° apart, each of 
which is screwed on the inner side of the base (C). One of the 
brackets is 12 em. and the others 5 cm. in length. When the 
electrometer is placed in position on these brackets a gap of 
about 10 cm. is left beneath it and the base, and it is possible 
to get at the key and other fittings underneath the electro- 
meter without disturbing its adjustmen 
M) is a sulphur or amber ins sulator carrying the wire 
which connects any apparatus outside the case to the mercury 
cup (NV), and (P) is another mercury ea) connected directly to 
the case, which is of course kept earthe 
) isa brass plate about 8 cms. square, soldered over an 
opening cut in the base. Four soft iron rods 8 mm. in diameter 
and 18 ems. long (two of which are shown in the diagram) pass 
through circular holes in the brass plate, each of which is 34 
ems. from the intersections of the diagonals of a square. The 
level of their ends is adjusted until each attracts the corres- 
ponding armature over it shot ne reg strongly, and then they 
are fixed by solder on the brass plate. On the portion of each 
rod which projects outside the “oe is wound a high resistance 
rag coil about 7 cms. long, consisting of 7 layers of 
current necessary for continuous working to about 0°2 ampere. 
Unless the heating effect is made as small as possible con- 
cially in damp weather and it is essential that each layer 
should be protected ~ tissue paper soaked in a solution of 
celluloid in sage rei 
e key (R), ehieh is the only additional fitting to the 
siekicedi aban itself, has been considerably simplified and im- 
proved. It consists of a vertical wire screwed directly to one 
