[Narrative Of The Voyage Of H.M.S. Rattlesnake, Commanded By The Late Captain Owen Stanley, R.N., F.R.S. Etc. During The Years 1846-1850. Including Discoveries And Surveys In New Guinea, The Louisiade Archipelago, Etc. To Which Is Added The Account Of Mr. E.B. Kennedy’s Expedition For The Exploration Of The Cape York Peninsula. By John Macgillivray, F.R.G.S. Naturalist To The Expedition. In Two Volumes. Volume 1. by John MacGillivray]@TWC D-Link book
Narrative Of The Voyage Of H.M.S. Rattlesnake, Commanded By The Late Captain Owen Stanley, R.N., F.R.S. Etc. During The Years 1846-1850. Including Discoveries And Surveys In New Guinea, The Louisiade Archipelago, Etc. To Which Is Added The Account Of Mr. E.B. Kennedy’s Expedition For The Exploration Of The Cape York Peninsula. By John Macgillivray, F.R.G.S. Naturalist To The Expedition. In Two Volumes. Volume 1.

CHAPTER 1
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I have since learned that H.M.S.Meander, Captain the Honourable H.Keppel, struck soundings on this bank, but have not been able to procure the particulars.) OBSERVATIONS ON THE WAVES.
During this passage some important observations were made by Captain Stanley and Lieutenant Dayman to determine the height, length, and velocity of the waves.

The results will be apparent from the following tabular view.* COLUMN 1: DATE 1847.
COLUMN 2: NUMBER OF OBSERVATIONS.
COLUMN 3: FORCE OF WIND NUMBER.
COLUMN 4: SPEED OF SHIP IN KNOTS.
COLUMN 5: HEIGHT OF WAVE IN FEET.
COLUMN 6: LENGTH OF WAVE IN FATHOMS.
COLUMN 7: SPEED OF WAVE IN MILES.
COLUMN 8: REMARKS.
April 21 : - : 5 : 7.2 : 22 : 55 : 27.0 : Ship before the wind with a heavy following sea.
April 23 : 8 : 5 : 6 : 20 : 43 : 24.5 : Ship before the wind with a heavy following sea.
April 24 : 6 : 4 : 6 : 20 : 50 : 24 : Ship before the wind with a heavy following sea.
April 25 : 9 : 4 : 5 : - : 37 : 22.1 : Ship before the wind with a heavy following sea.
April 26 : - : 4 : 6 : - : 33 : 22.1 : Ship before the wind with a heavy following sea.
May 2 : 6 : 4 and 5 : 7 : 22 : 57 : 26.2 : Sea irregular, observations not very good.
May 3 : 7 : 5 : 7 and 8 : 17 : 35 : 22.0 : Wind and sea on port quarter.
(*Footnote.

The height was determined by watching when the crest of the wave was on a level with the observer's eye (the height above the trough of the sea being known) either while standing on the poop or in the mizzen rigging; this must be reduced to one half to obtain the absolute height of the wave above the mean level of the sea.

The length and velocity were found by noting the time taken by the wave to traverse the measured distance (100 yards) between the ship and the spar towing astern.

In column 3, the number 4 denotes a moderate breeze, and 5 a fresh breeze.) Oceanic birds were plentiful in our wake, and gradually dropped off as we approached the tropic.


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