ON SEISMOLOGICAL INVESTIGATIONS. 63 
appear that these are not dependent on the distance at which they 
are recorded from an origin. 
XII. Large Earthquakes recorded at dijjerent Observatories, January 
to June 1910. 
The total number of large earthquakes, each of which disturbs 
a continental area, between January and June 1910, was about 166. 
Bach of these was recorded at from 3 to 50 or 60 different observatories, 
and all extended to a distance of more than 20 degrees from their 
origin. In the following tables, drawn up by the late Shinobu Hirota, 
instruments which record photographically are followed by the letter P, 
whilst those which write mechanically on a smoked surface are 
marked §. The Milne instruments, unless otherwise stated, are 
‘single-boom instruments recording East and West motion only. 
District I.—British Islands, Central and Western Europe. 
: ; : Tashen: No. of 
Station Foundation Seismographs DSUEH Cor. | 
ment | Records | 
Shide Disintegrated Chalk | Milne, twin boom P. 144 
Hamburg Alluvium Wiechert, Hecker Berges bal 
Edinburgh Andesite Lava Milne 1g. lll 
Bidston New Red Sandstone | Milne P. 75 
Strassburg . | Thick Compact | Wiechert, Rebeur- | P. & S 68 
Gravel Ehlert, Milne, Vicen- 
tini, Schmidt, 
r Mainka 
Gottingen . Wiechert . . ./P.&S 64 
Vienna . .| Alluvium . ._ . | Wiechert Weber 8. 64 
Paris . --. : Wiechert, Bosch- 8. 59 
Mainka 
Kew .. . | Thick Alluvium salIMING 6 BrtecbieM mown e si jen 58 
| San Fernando | Calcareous Rock . | Milne, two machines . ize 56 
| W. Bromwich | Thick Alluvium pal MITIG) iete come Meroe S. 55 
| Grenada . | Limestone . | Stiatesi, Wiechert, S. 50 
- Vicentini and Omori 
| Laibach . | Alluvium .  . — . | Vicentini, Grablovitz- | P. & S 43 
{o Belar, Rebeur-Ehlert 
| Eskdalemuir . | Paleozoic Rock . | Milne, twin boom P. 27 
Gatania. ©.|Rock. . .  . | Cancani, Vicentini, 8. 26 
ln. Agamennone, Omori 
| Malta .  . | Limestone ‘ . | Milne : 12 26 
| Azores .  . | Basalt Soe: wes Milnes sisi) bags. P. 23 
| Tortosa. .|Alluvium. . . Vicentini, Grablovitz . Ss. 22 
_| Monte Cassino | Limestone . . | Cancani <M higapes Ss. ily 
i , District Il.—North America. 
: ; P fnstvo- No. of 
Station Foundation Seismographs Weve Cor. 
ment | Records 
| Victoria, B.C. | Hard Pan above Ig-| Milne . . - ik 36 
4 neous Rock 
Toronto SP Aliaviumicet sep O3 Malne sf syle dys Vey 35 
Ottawa . .|BoulderClay . .|Bosch . - «+ +; iE 34 
7 13 
St. Louis,| Alluvium . . .{|Wiechert . - - 
