AS A VEHICLE OF SOUND. 
243 
Afloat. Ashore. 
Wind 
W., 2 to 3 
W.S.W., 3 
Barometer 
29-9 
29-6 
Wet bulb 
47° to 52° 
46° to 49° 
Dry „ 
48° to 52° 
47° to 50° 
November 25. Partial Summary . — 
Acoustic opacity nearly equal to that of July 3. At' 2-8 miles, with all 
quiet, sounds exceedingly feeble ; no 
guns heard. Gun yielded only a faint crack at 2j- miles. Day then very 
calm. Change of wind brought with it augmentation of sound. The Canadian whistle compared with the 
horn to-day, and found superior to 
it. Syren for a time not in action. 
Eight-inch whistle feeble to-day. 
Syren sounded afterwards both level and depressed ; no sensible difference. 
Afloat. 
Ashore. 
Wind 
Calm and E.N.E., 1 
S. and S.E., 1 
Barometer 
30-2 
29-8 
Wet bulb 
56° to 51° 
51° to 47° 
Dry „ 
52° 
53° to 48° 
The barometer and thermometer observations were made afloat by Mr. Edwakds ; ashore by Mr. Ayres. 
Table of Tanges of Holmes’s Horns. 
May 19th 
3| miles. 
„ 20th 
4 to 5| „ 
June 2nd 
6 „ 
„ 3rd 
9 „ 
„ 10th 
8f „ 
„ 25th 
H » 
„ 26th 
» 
July 1st 
12| „ 
„ 2nd 
4 „ 
„ 3rd 
H » 
and 12| miles. 
„ 4th 
H « 
Syren and Horns. 
Syren. 
Horns. 
October 8th 
9 miles. 
„ 9th 
n „ 
4 „ 
„ 14th 
10 „ 
10 „ and 7\ miles. 
„ 15th 
3-9 „ (Daboll). 
„ 16th 
no horn. 
„ 17th 
15 „ 
15 miles (4 horns). 
„ 20th 
- H » 
84 » 
„ 21st 
H „ 
4 „ 
„ 23rd 
^3 » 
6 „ (on land). 
„ 24th 
74 
3 i „ 
„ 27th 
H „ 
„ 28th 
7* „ 
no horn. 
„ 29th 
7 „ 
,, 
„ 30th 
• ••••• HI » 
8| miles. 
„ 31st 
3i „ 
2| „ bearing off Varne. 
November 1st 
6-9 „ 
(on land). 
„ 25th 
4 „ 
— 
Range of syren to range of horn as 7 : 5 nea 
.rly. 
