Page 13 Advertisements Column 4

Otago Witness, Issue 1341, 11 August 1877, Page 13

result arrived at by the use of theae figures in the operation approximates to the truth, but is not exact. A simpler and more correct method may be found from the following: When the radius of a circle is 1, the length of the whole circumference is 62831854, which, divided by 360° = -017453, the length of the arc of one degree. Hence, this decimal, '017453, multiplied by any number of degrees, and the product by the radius of a circle, will give the length of the arc of those degrees of that circle precisely. OLD FOSSIL sends the following :— Mathematicians affirm that of all bodies contained under the same superfices a Bphere is the most capacious ; but surely they have never considered the amazing capacity of a body of which the name is now required, and of which it may be truly affirmed that, supposing its greatest length nine inches, greatest breadth four inches, and greatest depth three inches, yet it contains a solid foot." J. MITCHELL sends the following question:— "It is known that the first indication of the recent great wave which must have traversed the entire North and South Pacific was selfregistered at Sydney, in south latitude 33° 41', (geocentric^ at 5.20, morning, on 11th May, local time. Supposing, what is not yet known, that the sfiock of earthquake which originated it took place at 20° 20' south latitude on the coast of South Peru, at 8 p.m. on the 9th May, • local time ; and presuming Stewart's Island not to have delayed its progress, what should be the approximate moan depth of the ocean in fathoms on the shortest track between the two places ; their difference of longitude being 9 hours 14 minutes, and gravity = 32 - 13 feet per second ? ANSWERS. A SAILOR, Naseby, writes:— "A friend of mine and I have had an argument concerning the rounding of Cape Horn. My friend holds that when a ship goes through the Straits of Magellan, she doubles the Horn. I hold that to double the Horn a vessel must go round outside of the island of Tierra del Fuego. Which of us is right?" Answer: You are right: to double Cape Horn you must go round outside of it, and not through the Straits. When a vessel enters the Pacificby the Horn route, through the Straits, it iB stated {vide Findlay's Directory) that "she passed through the Straits." The southermost point of Jthe South American Continent is Cape Forward, and there are several other capea in the Straits of Magellan. The northern side of the Straits is formed by the continent of America, and the opposite side by the island^ of Tierra del Fuego. As for Cape Horn, it is the southermost point of Horn Island, the southermost of the Hermite Islands, south of Tierra del Fuego. Q-— (1-) By law the licences for pheasant shooting go to the A cclimatisation Societies after deducting all necessary expenses attending their issue. (2.) The Otago Acclimatisation [ Society _ has made several attempts to introduce snipe from Australia, but has never succeeded. On one occasion a number of those birds were shipped at Newcastle for this Society, but although every care was taken of^ them, they all died before the voyage^was faxrly begun. J. S., Wyndham.— (l.) The Statute of Limitations prevents the recovery of a debt after i the expiration of six years from the day on , which it was contracted- or -became due ; but : it does not extinguish the debt itself. A .promise to pay, made within, sir years will keep the debt alive for another six years from the date of such promise. (2.) Lett's Diaries for 1877 are all sold off. Wise & Co., or J. Braithwaite, Dunedin, will post No. 26, for 1878, in two months, to any town in New for Zealand, 2s. A SUBSCRIBER.— If you intend to put down poison for fowls, public notice must be given of the fact.