272 REPORTS ON THE STATE OF SCIENCE, ETC. 
records. The two seismograms reproduced side by side in fig. 2 are of the same 
earthquake taken upon different machines operating in the same azimuth and on the 
same time circuit, but in separate buildings 60 feet apart. The machines were on test 
at West Bromwich, their standardising being incomplete. The respective nominal 
magnifications were 141 and 161, which accounts for the slight difference in amplitude. 
The amplitudes of the large wave after the 26th minute are in the ratio of 141 to 163. 
as 
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Bulletins and Tables. 
The ‘ International Seismological Summaries’ for July to September 1918 and 
October to December 1918, for January to March 1919, April to June 1919, and July 
to September 1919, have been printed and distributed. October to December 1919 
is in the press; and for the year 1920, January to March is being finally checked for 
press, and the first draft is made for the months April to August. This steady pro- 
gress has been rendered possible by the services of Mr. J. S. Hughes. 
