384 
DR. P. E. SHAW ON THE NEWTONIAN CONSTANT OF 
Table IY.—Summarised Results of Several Experiments. 
Date. 
Range at 
15°. 
Greatest 
temperature 
rise. 
Range at 
highest 
temperature. 
Effect for 
r C. 
Comments. 
8 C. 
'Chains and cylinders. 
June 23,1914. . 
57 ■ 60 
150 
57-70 
+ 1-1 x IO - 5 
(See Table I.) 
_ Pressure = lp. 
May 24, 1915 . . 
201-9 
185 
202-5 
+ 1-6 x10- 5 
„ 26, 1915 . . 
209-2 
200 
209-6 
+ 0-9 x 10 -5 
July 14, 1915 . . 
200-8 
135 
201-5 
+ 0-9 x 10~ 5 
)>Pressure = 2 mm. 
„ 16, 1915 . . 
200-8 
180 
201-35 
+ 1 - 4 x 10- 5 
J 
„ 24, 1915 . . 
200-8 
150 
201•35 
+ 1-8 x 10- 5 
Pressure = 4 mm. 
Let in air to 
14 mm. pressure. 
July 27, 1915 . . 
200•85 
160 
201-25 
+ 1 - 2 x10~ 3 
(See Table II.) 
August 4; 1915 . . 
200-8 
160 
201-2 
+ 1 • 3 x10~ 5 
„ 5, 1915 . . 
196-3 
140 
196-5 
+ 0-8 x IO - 5 
8, 1915 . . 
193-45 
180 
193-95 
+ 1'3 x10- 5 
„ 10, 1915 . . 
193-25 
180 
193-9 
+ 1-6 x10~ 3 
12, 1915 . . 
175-45 
190 
175-75 
+ 0-9 x10 -5 
„ 18, 1915 . . 
175-45 
210 
173-75 
+ 0-9 x 10- 3 
„ 19, 1915 . . 
175-55 
220 
176-15 
+ 1 - 5 x10~ 5 
Demagnetise 
balls. 
August 21, 1915 . . 
175-5 
200 
175-95 
+ 1 -3 x 10~ 5 
(See Table III.) 
„ 22, 1915 . . 
199-5 
200 
199-7 
+ 0’5x 10 -5 
„ 24, 1915 . . 
201-25 
210 
201-65 
+ 1-0 x10~ 5 
„ 25, 1915 . . 
190-75 
230 
191-2 
+ 1 • 1 x 10- 5 
Rotate M, M 
by 180°. 
August 30, 1915 . . 
185-7 
150 
186-2 
+ 1-7 x10“* 
Mean effect . . . . j + 1-2x10 5 
The readings in columns 2, 4 are in millimetres. 
It will be observed that the vacua used vary from 1 p. (for chains) down to the low 
vacuum 14 mm., which proved most satisfactory when tried for spheres, and was 
used always afterwards. 
VII. Tests Applied. 
We have now proved that there is a temperature effect which repeats itself 
with as much consistency as can be expected in a delicate apparatus, where 
the effect observed is only O'o mm. of scale reading. But this effect need not be 
a gravitation/temperature effect, but may be wholly or in part due to systematic 
