268 REPORTS ON THE STATE OF SCIENCE, ETC. 



be used in conjunction with the Catalogues of Earthquakes arranged in order 

 of date ; the last of these, covering the years 1 925-1 930, was also prepared 

 by Miss Bellamy and was published in the B.A. Report in 1935. The 

 Committee wishes to congratulate Miss Bellamy on the completion of a 

 catalogue which will be gratefully appreciated by all seismologists. 



The New Globe. 



The new globe for use in determining epicentres at Oxford has been in 

 service since October, 1936, and is a great success. This instrument was 

 made by Casella, London, and is of brass with an electroplated surface 

 which will take either an ink or pencil line extremely well, and yet can be 

 cleaned easily. The globe is set on a wooden stand which supports a bed 

 of baize, so that by rotation any point of it may be made the highest. A 

 detachable arm can be screwed to the side of the stand, and bears a pointer 

 and moveable celluloid scale which rotates at will and measures distances 

 and azimuths of any points on the surface relative to an origin which is the 

 highest point of the globe and immediately beneath the pointer. The 

 azimuth scale is fixed to the wooden stand and is graduated from 0° to 360° 

 in both clockwise and counter-clockwise directions, so that in dealing with 

 earthquakes either the epicentre or anti-centre may be used as origin. 



There are also compasses graduated from 0° to 120° for drawing arcs of 

 circles on the globe ; these bear a point at one end for insertion into a small 

 hole whose position corresponds with that of an observing station and a 

 ' stylo ' type of pen at the other ; this latter caused considerable trouble at 

 first as the tube of the pen was continually being blocked with dried ink, 

 but this difficulty has now been overcome. There is also an alternative 

 fitting bearing a lead pencil. 



The exact size of the globe is such that 10° of arc equals 4 cms., so that 

 roughly the diameter is 18 in. The weight is about a half hundredweight 

 and constitutes a handicap when it is necessary to turn the globe round 

 by hand, although with practice it soon becomes comparatively easy to set 

 to any part of the surface with ample accuracy. The surface has been ruled 

 in 10° intervals of both latitude and longitude as far as 80° north and south 

 of the equator and the accuracy of the ruling is great, so that were it not 

 for a systematic error in the flexible scale distances could be read off exactly. 

 As it is, the scale is in error by i per cent, or thereabouts and this must be 

 allowed for, a point which hardly detracts from the utility of the instrument. 



Small holes in the surface have been drilled in positions corresponding 

 to the principal observing stations and an abbreviated name engraved 

 against each ; this was done before the electroplating, so that the surfacing 

 was not marred by the engraving. 



The International Seismological Summary, 1932 — Some Notable 



Earthquakes. 



By y. S. Hughes. 



In the report for 1936 attention was drawn to a shock on 1931 August 10, 

 from an epicentre in Western Mongolia, whose observational data possessed 

 considerable abnormality, and I pointed out that their effect was to give a 

 divergence from the normal, similar in extent but opposite in sign to that of 

 a depth of focus 0-030. Subsequently a further independent investigation 

 by Dr. Stoneley made it extremely probable that the data referred to 

 two shocks having the same origin but separated by an interval in time of 



