216 ' REPORT—1896. 
which the pendulum was suffering displacement. My late colleague, 
Mr. C. D. West, who from time to time has sent me these readings which 
are taken by one of the college servants, tells me that the displacement of 
January 26-27, 1896, cannot be accounted for, but the readings generally 
follow the seasonal changes in temperature—a conclusion which is at least 
true for 1895. Fig. 11. 
With the assumed values for the readings the approximate changes in 
the vertical have been as follows :— 
" 
September, 1894, to June J1, 1895 - - 160 East side sinking 
June 11, 1895, to August 23, 1895 ‘ yO “§ rising 
August 23, 1895, to November 24, 1895 a LO 3 sinking 
November 24, 1895, to January 27,1396 . 60 “A rising 
January 27, 1896, to February 29, 1896 ae 2D ai sinking 
Total change during whole period : Be ara) S sinking 
This long-continued creeping in one direction is common to observa- 
tions made by Plantamour and others who have made like investigations. 
Fig. 11.—Change in Level observed in Tokio. 
ek 
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SON DSYSFMAMSSASONDSFMA 
IEIF TEGS 1896 
IV. Eaperiments with a Horizontal Pendulum at the Oxford University 
Observatory, 1896, May 5. Drawn up by Professor H. H. Turner. 
1. During the morning Professor Milne set up his horizontal pendulum, 
which is similar to the one at Shide, on the slate slab in the Students” 
Observatory. The level of the transit circle was set up on the same slab 
near the H.P., and watched throughout by Captain E. H. Hills, R.R. 
This slab rested on a hollow foundation of bricks about 10 inches in 
height, which in turn rested upon a bed of concrete a few inches in thick- 
ness, and common to the whole building. Beneath the concrete there is. 
a natural bed of gravel a few inches in thickness. Because the horizontak 
pendulum, which pointed from E. to W., stood on the slab near to its edge, 
it was to be expected that a load on the south side at a distance of, 
say, 3 feet would produce a greater effect than the same load would pro- 
duce when moyed to the north side, where it would be distant 7 or & | 
feet. 
