74 Mr, Davy’s Experiments , 
Explanation of the Figures. 
Fig. l. The apparatus for electrizing potassium in gasses. 
A the glass tube. B the wire negatively electrified. C and D 
the cup and wire positively electrified. 
Fig. 2. The apparatus for decomposing water, out of the 
contact of air, page 41. A A the cones containing the water. 
BBB the tubes for conveying the gas. C and D the pneumatic 
apparatus. 
Fig. 3. The apparatus for decomposing, and recomposing 
water under oil. CC the wires for communicating the Vol- 
taic electricity. DD the wires for producing the explosion. 
B the tube. A the vessel containing it. a. d. c. the level of the 
different fluids. 
Fig. 4. The apparatus for exposing water to the action of 
ignited potash and charcoal, out of the contact of air. A the 
tube for water. B the iron tube. C the receiver for the am- 
monia. D the pneumatic apparatus. 
Fig. 5. The apparatus for the decomposition of ammonia. 
Fig. 6 , A Voltaic apparatus, being one of the 200 which 
compose the new Voltaic battery of the Royal Institution. 
For the construction of this battery, and of other instruments 
applicable to new researches, a fund of upwards £1000. has 
been raised by subscription, from members of the Royal 
Institution. As yet, the whole combination has not been put 
into action ; but reasoning from the effects of that part of it 
which have been used, some important phenomena may be 
expected, from so great an accumulation of electrical power. 
