800 ME. Gr. GOEE ON THE PEOPEETIES OP ELECTEO-DEPOSITED ANTIMONY. 
were taken; one was suspended in the air-bath of the calorimeter and heated with 
moderate speed until the discharge occurred, to determine ajpproximately its dischargmg 
point; the second was then tried, raising the temperature of the bath with increasing 
slowness until within ten to four degrees of the discharging point; the bath bemg then 
kept stationary at that temperature, the metal began to evolve its heat, raismg its o^ 
temperature above that of the bath, slowly at first, and then more quickly, until the 
sudden discharge took place. In some cases, where the quantity of metal operated 
upon was small, and especially if the temperature of the suinounding bath was a tew 
degrees too low, the heat was evolved gradually without any sudden discharge. 
1. Coarse granules (fresHy formed) IsoSo’ in a fine brass gauze basket. Discharged suddenly at 
' I 
o 1 ^ vapour. 
2. Bars and tliin pieces (stale) 600'00 in a thin copper bucket 
3. Thin pieces (stale) 572-27 in a thin copper bucket 
4. Thin pieces (freshly formed)...... 96-16 in a thin copper bucket 
5. Bars (formed one day) 249-78 in a fine brass gauze basket 
6. Bars (recently deposited) 605-09 in a thin copper bucket 
7. Lumps (recently deposited) ...... 445-24 in a thin copper bucket 
8. Powder (stale) 307-77 in a closed brass vessel 
9. Powder, but had been kept in a | ^ dosed brass vessel 
10. Powder, but had been kept in a | ^ dosed brass vessel .... 
warm place J 
11. Fine powder 300-00 in a thin copper bucket ... . 
Discharged suddenly at 205-5 
Discharged suddenly at 198-0 
Discharged suddenly at 196-5 
Discharged suddenly at 196-0 | 
Discharged suddenly at 184-0 
Discharged suddenly at 183-1 
Discharged suddenly at 178-0 
I" Discharged gradually 't 
L during two minutes at J 
r Discharged suddenly t 
1 hut feebly at J 
Discharged suddenly at 166-0 
and lost 4-70 per 
cent, in vapour. 
In a former experiment (35.), with less perfectly amorphous metal, a much higher 
temperature of discharge was observed, partly because a bath of mercury was employed 
which conveyed the evolved heat more rapidly away. ^ 
70. It is probable that the real temperature of sudden discharge is above 2I2°-0 Fahk., 
because the temperature observed in each of the above experiments was only that of the 
external surface of the basket ; the centre of the mass or heap of antimony was probably 
at a much higher temperature. It also %)pears that the discharge is not limited to a 
particular temperature, but commences between 170° and I90 °Fahk.., and graduaUy 
increases in rapidity to some point above 2I2 °Fahe., when it attains its maximum, and 
becomes sudden. 
71. Small thin pieces of the substance formed at the same period, and in the same 
liquid as those of Nos. 4 and 6, were heated a few minutes in water at 209 ° Fade., and 
in air at 203° Fare, without losing their heating power ; but by immersing them in boihiig 
water during twenty minutes, nearly the whole of the heating pouer was lemoie 
without loss of weight in the pieces. Two portions of 20 grains each were also place , 
one in a fine brass wire-gauze vessel, and the other in a water-tight copper bucket, an 
both immersed in boiling water during thhty minutes : at the end of that time the heating 
power of each had disappeared ; the former had gained OTl grain in weight (probably 
by absorption of water), and the weight of the latter had remained unaltered. 
72. The thermic power may be exhausted either gradually or suddenly, and the cmi- 
ditions of gradual or sudden discharge appear to be these -if the amount of coo iiig 
