"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.