ON SEISMOLOGICAL INVESTIGATION. 183 
12. Russia: Nicolaiew. The Observatory. 
Director, Professor T, Korvrazzi. 
The Observatory of Nicolaiew (lat. 46° 58’:3, long. 2h. 7m. 9s.) is 
situated on a sandy hill with gently sloping sides at an elevation of 50m. 
above sea level. The streets of the town are at a distance of 150m., and 
the railway more than | km. 
The von Rebeur Horizontal Pendulum, with its photographic regis- 
tering apparatus, is placed in a cellar on a pillar isolated from the walls 
and the floor, The pillar is built of large blocks of very compact lime- 
stone, covered with tar to prevent the absorption of moisture. The annual 
change of temperature in the cellar does not exceed 4° R. Diurnal changes 
are not perceptible. A deviation of 1 mm. in the position of the light spot 
indicates a tilting of the pillar in the direction of the meridian of 0’-012. 
The recording surface moves at the rate of 22 mm. per hour. 
The Nicolaiew Register. 
The times for commencement, reinforcement, maximum, and weakening are 
indicated in Greenwich mean civil time :—4 amplitude = ya in millimetres. P.T/s= 
duration of preliminary tremors. 
; Nl : 
~. |Shide {Commence-| Reinforce- e. | | Weak- Dara As : | 
Xo. a Date Wont | afore Maximum | ha | ening | on fi Ss Remarks 
i { ul | | 
| 1898. / 
| | | H. M tes. 5 He M. | MM. | ow) | Hsu} at 
1} — | Mar. 6/ 2 46 | 3 2 ee ee — | 036 | 16 
Aes Of 19npalee- 14 19 13 20 { = 12! 5 
sh) , 25) 19 39 19 47 
573 19 58 9 20 3 2 58'| 8 
4); — BEND 9 9 56 55 110 7|040/ 3 
5) — seh On|) Tee 37 15 595 | 16 2 105 [16 9) 1 15 | 295 
0 16 75 019 
§ 182 a) LOL 8 22 § 30 8 34 4 _— 0 30 8 
i 185 Apr. 3 6 53 — 6 58 3 — 0 8 _— 
8| 189 eh Tien lod = i 60 + |28 =, es) ee 
9 _ AA op il 22 48 22 575 23 22 16 23 52 | 2 44 od 
10| — ay Dee |) BBE AT — 23 58 10 -- — — | Pendulum in- 
li 193 ae — (te 0 45 | 38 1 37 | 3 37 — clined 8 mm. 
12 195 9s 25 11 105 ae ad ll 44 9 11 49} 142) 85 tothe S. 
13; — i 28 14 27 14 445 14 54 75 — | 057, 175 
14} 196 5 29136 30 1G 445 
LG 92 ioe A 21 17 47 | 2 22 | 145 
15 | 199| May 7] G 4 6 i 6 38 | 25 712|233| 7 
ie — Seoul 19). au 9 39 9 42 4°5 2h O85 )) ee 
17 _ ef ee 2 2 _ 2 22 4 — 1 20 _—. 
Rk) — June 1 5 47 5 52 5 54 6 6 7] 0 48 8 
19 210 EF } 16 57 —_— Dee 1) 5 —_— 0 30 —_— 
20); — 2 6 19 37 — 19 58 5 — | 021) 21 P.T.’s followed 
21} 213 5 LN. 0) “87 0 41° O 44 38 — |045) — by a single 
22) 214 5 29 | G64 Tl jemth ally 7 46 shockat 19h. 
i — 7 eo 15 755/3 1) — 58m. 
23 —_— eS 23 «3k —_— 23 47 2 — 0 9 6 
24 215 351 129 18 42 18 59 18 59 50? _ — 12 
| 19. 17. 40? _— 3 45 At 18h. 59m. 
Q5')' S16"| July 2) 4 29 4 23°5 ii) 9 _— — 15 to 19h, 7m. 
26 meh 199.38 —_— 19 41 3 _ 0 15 _ and 19h. 
27; — | Th 0) 48 _ 0 54 3 — |034) — 7m. to 19h. 
28 221 | as Le 17 30 17 45 17 52 10 _ 0 37 | 15 22m. the 
20 pets 6 22 6 37 6 37 2°5 — | 0 32] 12 traces are 
30. 225 Aug. 8 8 25 8 44 8 54 7 917 | 1 47 | 19 searcely 
31 ell Se} O 4% — 0 7 6 —_ 0 27 — visible. 
32 —_ pea}. 16 375 —_— 16 39 25 _ 0 75 _ 
33 230 Ae 20. 39 — 20 42 20 — 058) — The photo- 
B4 — | Sept. 1 9 11 9 20 9 39 22 10 10.) 2 29 9 gram indis- 
35 _ aoe Liat 19 16 _— 19) 29 4 19 47 tinct. 
| | 20 0 6 — Leis “a 
36 | ,231 > 3) 16 32 15 59 1662 7 — |120 = 
37 232 » 138 | 18 145 — 18 34 | 10 
} \ 19 12 13 — 1|138| — 
