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قراءة كتاب Across India; Or, Live Boys in the Far East
تنويه: تعرض هنا نبذة من اول ١٠ صفحات فقط من الكتاب الالكتروني، لقراءة الكتاب كاملا اضغط على الزر “اشتر الآن"
class="c10">"So I have! I should have said multiply by 60," added the young lady.
"That would not do it any better," replied Scott.
"Degrees of latitude are always the same for all practical purposes; but degrees of longitude are as--
'Variable as the shade
By the light quivering aspen made,'"
continued the third officer, who was about to say "as a woman's mind;" but he concluded that it was not quite respectful to the lovely being before him.
"What a poetical sea-monster you are, Mr. Scott!" exclaimed Miss Blanche with a silvery laugh.
"I won't do so any more," Scott protested, and then continued his explanation. "Degrees of longitude vary from nothing at the poles, up to 69.07 statute, or 60 geographical or sea-miles, at the equator. We are now in about 15° north latitude; and a degree of longitude is 66.65 statute miles, or 57.9855 sea-miles, near enough to call it 58. By the way, Louis, multiply the number of statute miles by .87, and it gives you the sea-miles. Divide the knots by the same decimal, and it gives the statute miles."
"I will try to remember that decimal as you have done," replied Louis. "Now, Mr. Scott, don't open Bowditch's Navigator to us, or talk about projection,' 'logarithms,' 'Gunter,' and 'inspection;' for I am not capable of understanding them, for my trigonometry has gone to the weeping willows."
"Talk to us in English, Mr. Scott," laughed Miss Blanche.
"Let us go up to Conference Hall, where there is a table," said the third officer, as he produced a book he had brought up from his state-room. He led the way to the promenade, where he spread out a chart in the "Orient Guide," which had twenty-six diagrams of a clock, one at the foot of every fifteen degrees of longitude. At this point the commander came upon the promenade.
"Formerly the figures on a timepiece in Italy, and perhaps elsewhere, went up to twenty-four, instead of repeating the numbers up to twelve; and these diagrams are constructed on that plan," continued Scott.
"An attempt has been made to re-establish this method in our own country. I learned once from a folder that a certain steamer would leave Detroit at half-past twenty-two; meaning half-past ten. But the plan was soon abandoned," interposed the captain.
"Aden, from which we sailed the other day, is in longitude 45° east. Every degree by meridians is equal to four minutes of clock-time. Multiply the longitude by four, and the result in minutes is the difference of time between Greenwich and Aden, 180 minutes, or three hours. When it is noon at Greenwich, it is three o'clock at Aden, as you see in the diagram before you."
"Three o'clock in the morning, Mr. Scott?" queried the commander.
"In the afternoon, I should have added. Going east the time is faster, and vice versa," continued the young officer. "At our present speed our clocks must be put about twenty minutes ahead, for a third of an hour has gone to Davy Jones's locker."
"I understand all that perfectly," said Miss Blanche with an air of triumph.
"You will be a sea-monster before you get home. The sirens were beautiful, and sang very sweetly," added Scott jocosely.
"They were wicked, and I don't want to be one. But I do not quite understand how you found out what time it was at noon to-day," added the young lady.
"For every degree of longitude sailed there is four minutes' difference of clock-time," Scott proceeded. "You know that a chronometer is a timepiece so nicely constructed and cared for, that it practically keeps perfect time. Meridians are imaginary great circles, and we are always on one of them. With our sextants we find when the centre of the sun is on the celestial meridian corresponding to the terrestrial one; and at that instant it is noon where we are. Then we know what time it is. We compare the time thus obtained with that indicated by the chronometer, and find a difference of four hours."
"I see it all!" exclaimed the fair maiden, as triumphantly as though she had herself reasoned out the problem. "Four hours make 240 minutes, and four minutes to a degree gives 60° as the longitude.
"Quite correct, Miss Woolridge," added Scott approvingly.
"If I could only take the sun, I could work up the longitude myself," the little beauty declared.
"You have already taken the son," replied Scott; but he meant the son of Mrs. Belgrave, and he checked himself before he had "put his foot in it;" for Louis would have resented such a remark.
"I have seen them do it, but I never took the sun myself," protested the maiden.
The sea had suddenly begun to make itself felt a few hours before, and a flood of spray was cast over the promenade, which caused the party to evacuate it, and move farther aft. It was the time of year for the north-east monsoons to prevail, and the commander had declared that the voyage would probably be smooth and pleasant all the way to Bombay. It did not look much like it when the ship began to roll quite violently.
CHAPTER II
THE WRECK IN THE ARABIAN SEA
It was a sharp squall that suddenly struck the Guardian-Mother, heeling her over so that everything movable on her decks or below went over to the lee side, and sending no small quantity of salt water over her pilot-house. It had begun to be what the ladies called rough some hours before; and with them Captain Ringgold's reputation as a prophet was in peril, for he had predicted a smooth sea all the way to Bombay.
The Blanche, the steam-yacht of General Noury, which was only a trifle larger than the Guardian-Mother, rolled even more. She was following the latter, and seemed to be of about equal speed, though no trial had been made between them. Miss Blanche and Louis had retreated to a dryer place than the promenade when the shower of spray broke over the pilot-house upon them, leaving the commander and Mr. Scott there.
Captain Ringgold frowned as he looked out on the uneasy waves, for the squall appeared to be a surprise to him; but it proved to be more than a white squall, which may come out of a clear sky, while with a black one the sky is wholly or partly covered with dark clouds. It continued to blow very fresh, and the commotion in the elements amounted to nothing less than a smart gale.
"This is uncommon in the region of the north-east monsoons," said the commander, who was planking the promenade deck with Scott. "During January and February the wind is set down as moderate in these waters. I have made two runs from Cape of Good Hope to Bombay, and we had quiet seas from the latitude of Cape Comorin to our destination both times; and I expected the same thing at this season of the year on this voyage."
The captain was evidently vexed and annoyed at the failure of his prediction, though squalls were liable to occur in any locality; but the present rough weather had begun to look like a gale which might continue for several days. The north-east monsoons were what he had a right to expect; but the gale came up from the south south-west. The commander appeared to be so much disturbed, that the young officer did not venture to say anything for the next half-hour, though he continued to walk at his side.
At the end of this time the commander descended to his cabin, inviting Scott to go with him. On the great table was spread out the large chart of the Indian Ocean. From Aden to Bombay he had drawn a red line, indicating the course, east by north a quarter north, which was the course on which the steamer was sailing.
"Have you