68 REPORT OF THE CALIFORNIA EARTHQUAKE COMMISSION, 
The periods during the strong motion approach those of the pendulums and therefore 
we can not estimate the earth’s movement; the fact that the marker goes beyond the 
limits of the record very near the beginning of the strong motion shows, however, that the 
earth’s displacement was large. 
CLEVELAND, OHIO. 
St. Ignatius College Observatory. Rev. F. L. Odenbach, 8. J., director. 
Lat. 41° 29’ N.; long. 81° 42’ W.; altitude, 230 meters; distance, 31.47° or 3,498 km.; * 
chord, 3,456 km.; direction, N. 71° E. 
Foundation, stiff clay. 
Seismograms, sheet No. 3. 
The instrument used was a heavy pendulum, prevented from swinging by four carbon 
rods pressing against it in directions 90° apart. Electric currents pass thru the carbons 
and the pendulum and then thru carefully balanced solenoids, which carry pens marking 
on white paper. At the time of a shock the pressure of the pendulum against the carbons, 
and hence the currents, vary, and the marking pens are displaced, making a record. 
The preliminary tremors cannot bemadeout; but the principal part begins about 135 29.4™. 
TORONTO, CANADA. 
Meteorological Office. R. F. Stupart, F. R. 8. C., director. 
Lat. 43° 40’ N.; long. 79° 23’ E.; altitude, 107.5 meters; distance, 32.93° or 3,571 
km.; chord, 3,610 km.; direction, N. 66° E. 
Foundation, boulder clay, 32 meters above Lake Ontario. 
Seismograms, sheet No. 1. 
The instrument used was a Milne horizontal pendulum, east component; photographic 
registration. 7, 14.8 seconds; V, 6.1; J, 330 meters; e€, 1.051; angular displacement, 
1 mm.= 0.66”; M, 255 gm.; L, 15.6 cm. 


First PRELIMINARY | SECOND PRELIMINARY REGULAR Max 
REMOBS. TREMORS. WAVES. AMPLITUDE. 
min. min. min. min. mm, 
East component . . . 19.3 24.5 27.9 33.3 17+ 
Interval = en 6.8 12.0 15.4 

Beginning given as 19.3"; intensified at 24.5"; and again at 27.6"; at 32.0™ the 
records join from opposite sides, 7.e., the amplitude was greater than 17mm. This con- 
tinues with one interruption for 10 minutes. The motion dies down considerably, but 
at 55.0™ the sides again join for 2 minutes with one small interruption. The remainder 
of the record is subsiding. The period during the strong motion can not be determined 
from the seismogram on account of the close time scale, but from records at other stations 
it could not be very different from that of the pendulum, and this accounts in part for the 
large amplitude. 
HONOLULU, HAWAIIAN ISLANDS. 
Magnetic Observatory of U. 8. Coast and Geodetic Survey. O. H. Tittmann, superin- 
tendent; 8. A. Deel, magnetic observer. 
Lat. 21° 19’ N.; long. 158° 04’ W.; distance, 34.60° or 3,846 km.; chord, 3,790 km.; 
direction, S. 71° W. 
Foundation, directly on solid coral rock. 
Seismograms, sheet No. 2. 
The instrument used was a Milne horizontal pendulum, east component; photographic 
registration. T,, 19 seconds; V,6.1; J, 560 meters; M, 255 gm.; L, 15.6 cm. 
