388 
MESSRS. W. E. AYRTON AND H. KILGOUR ON THE 
Table VIII. 
Diameter, 11T mils, or 0'282 millim. Length, 28‘35 centims. Water-jacket, 15° C 
May 2nd, 1888. Fig. II. 
Current, 
iu amperes. 
P.D., 
in volts. 
Resistance, 
in ohms. 
Equivalent 
temperature of 
wire. 
Emissivity. 
0-05 
0-02817 
0-5634 
°C. 
0-075 
0-04241 
0-5655 
o-io 
0-05655 
0-5655 
0-15 
0-08532 
0-5688 
0-20 
0T133 
0 - 5665 
0‘25 
0-1415 
0-5660 
0-30 
0-1694 
0-5647 
0-40 
0-2260 
0-5650 
- 
0-50 
0-2867 
0-5734 
0-60 
0-3479 
0-5798 
25-6 
•002054 
0-80 
0-4782 
0-5978 
37-3 
•001705 
1-00 
0-6148 
0-6148 
48-7 
•001787 
1-20 
0-7583 
0-6319 
60-0 
•001965 
1-50 
1-007 
0-6713 
84-9 
•002081 
1-80 
1-307 
0-7261 
121-1 
•002123 
2-10 
1-667 
0-7938 
166-0 
•00221L 
2-40 
2-088 
0-8700 
215-4 
•002379 
2-70 
2-587 
0-9581 
273-7 
•002563 
As in the case of Table VII., the first nine observations in Table VIII. were made 
only for the purpose of enabling the early part of the curve in fig. 9 to be drawn. In 
the following Table IX., which gives the results for the remaining wires, the first 
eight or nine observations that were made in each case are omitted, since, although 
these observations were of value in enabling the early part of the curve, such as 
is shown in fig. 9, to be drawn for each wire, the difference between the temperature 
of the wire and of the water-jacket was too small to enable the corresponding emis- 
sivities to be accurately calculated. 
Table IX. 
Diameter, 9'3 mils, or 0 - 236 millim. Length, 27‘86 centims. Water-jacket, 15 Q, 9 C. 
April 28th, 1888. Fig. 11. 
Current, 
in amperes. 
P.D., 
in volts. 
Resistance, 
in ohms. 
Equivalent 
temperature of 
wire. 
Emissivity. 
0-60 
0-5193 
0-866 
0 C. 
40-9 
•001441 
0-80 
0-7078 
0"885 
49-9 
•001926 
1-00 
0-9206 
0-921 
66-9 
•002087 
1-20 
1T554 
0-963 
86-1 
•002281 
1-40 
1-423 
1-016 
113-6 
•002353 
1-70 
1-895 
1115 
164-8 
•002495 
2-00 
2-484 
1-242 
232-4 
■002642 
2-30 
3-186 
1-385 
310-0 
•002865 
