SEISMOLOGICAL PHENOMENA. 41 
WESTERN AUSTRALIA. 
From the Government Astronomer. 
Dear Stik, 7 
(a.) Herewith a list of the only earth tremors recorded in 
this State since Ist January, 1900. These are never felt 
by people, but were recorded on a Milne Seismograph, which 
was mounted act the beginning of October, 1901. 
(6.) and (c.) The only seismological work carried on in 
this State is a record, by means of a Milne Seismograph, of 
any tremors experienced in Perth. 
(d.) The superior sensibility of the Milne over older forms 
of instrument appears to have been demonstrated on 
16th November, when the record here had an intensity of 
8:2 m.m. This I take to be the earthquake which caused 
so much damage in the Cheviot district of New Zealand, and 
yet I understand, from a telegram received from you, that 
your instrument (old form) showed no trace whatever. 
Yours faithfully. 
W. ERNEST COOKE. 
To P. Baraccui, Esq., 
. Secretary Seismological Commuttee, A.A.A.S. 
10th December, 1901. 
EARTH TREMORS AT PERTH (W.A.). 
7h, 48m. 21°74s. — 31° 57’ 09-6". 
Preli a Maxi Intensity in 
goin. | Rylim | pent, | Mestmem | ring, | mieten, 
Motion, 
1901. heme hems h. m. hey) amt 
Oct. 8 a a WP 3 32 3 42 4 40 2°0 
19 8 59 10; 6 10° 23 TAP ots 5°5 
29 7 59 8 U2 8 16 9 06 3°7 
31 G05) ae 46a 6 25 6 45 De 
Nov. 13 106 2310 10nsod 10 37 I~ 05 9°6 
15 20/2 20527 20 53 2136 8°2 
25 0 25(@) 1. 54 Daa 5 05 2-1 
Dec. 2 14 63 14 18 14 22 14 34 1°5 
2 (2nd shock) 15 - 06 15. “138 15 36 1:0 
5 17. +39 17 48 17. +565 LS So 7:0 
6 Clock drivjing badly Le ce 4°6 
