NOTES AND QUERIES.

Otago Witness, Issue 2179, 28 November 1895, Page 42

NOTES AND QUERIES.

Questions for reply -in coming issue to be received not later than Monday night. Miner.— Mr Beverly kindly replies :— A race sft deep, 4ft wide at top and 2ft Gin at bottom, will carry 120 heads of water, or 120 cuhic feet per second. The sectional area is 16 square feet, and the mean velocity 7ft 6in per second, 16 X7J = 120. The sides of the race are too steep, and unless the ground is very firm the Ecour will wash them down. Twenty feet per mile is too great a fall for a race of this size ; better make it wider at top and reduce the fall. The pressure in an open race js the same at the end as at the beginning ; it does not convey pressure like a pipe. A pipe in the same position would have a 40ft pressure at the end when closed. Chanticleer.— The simplest and yet one of the most; effective methods is to dissolve one pint of salt in lgal of wnter ; slack 21b of quicklime in 3gal of water ; when entirely slacked, stir and allow it to settle two or three times, and then pour the clear liqtrid off into a crock or any receptacle that can be covered, and add the ealt water, making in all 4gal of liquid. Eggs placed in this must be perfectly fresh, cl*an, and not cracked. They must be lowered into the liquid, and not allowed to drop to the bottom of the crock, theieby running the risk of being br 'ken. No treatment of eggs before putting in brine is necessary. Gk R. D.— (1) We presume you mean the article on the extension of the cyanide process in our issue of September 12. (2) Yes, that is what it is for. (3) We cannot pay. Probably Mr \V. J. Stanford, manager of the Achilles Company, would be able to give you an idea. Meg.— (l) A short note if sent, but if brought personally of course verbal thanks would be sufficient. (2) Three shillings. Inquisitive.— Mr Beverly kindly replies :— (I) A pyramid 6x6 base, 6ft high, is one-third of a Bix cube. (2) To find the contents of any pyramid multiply the area of the base by a third of the perpendicular height. R.. W.— The best plan to deal with fowl droppings isto keep the floor of the fowlhouse covered with fine soil, and to run over this every ra irning either with a hoe or a spade. Every thn>e or four weeks the floor should be cleaned. If you want to keep it till you have a large quantity put it into a barrel, and keep covered up to prevent the rain getting into it. It is ready to use at any time without further pre.paration. T. T.— The coal is not really burned in making gas —it is distilled, and the gas passed off fiom the coal without making any flame. The retorts, so called, are the ovens used for dibtilling coil. When the retorts are filled with coal the doors are closed tight, and the coal inside is heated red-hot, when it gives 6ff air, steam, tar, ammonia, and gas. All these pass into one large pipe at the back of the retorts ; the tar and ammonia turn oft into cisterns, and the hot gas goes into coolers. After it is cooled it in next purified by passing over lime, which takes up aH the acids ln lfc : nn nd lastty Jt is P ut into gasholders for "use. 1 hese gasholders arc the very large round iron boxes which are seen at all gasworks. Each one ia open «t the bottom, which stands in a great tank of water, and it is so hung with weights and chains that it will float in it and will rise asthe gas collects in it. X. Z.— To do so would be to commit a breach of the Gaming and Lotteries Act. Constant Reader —Cutting your broom hedge down will not kill it. Most injury would be caused to it by cutting it down in midsummer, but you will have to grub out both the stumps and the crop of youug plants which will spring » up. H. H. H. — Under the conditions you name the only one open to you would be the colonial. \ Write to the Department of Defence, Wellington. Dairyman.— Babcook's method of milk testing : Measure 18 ccs. of milk into one of the bottle 3 and add 17 5 ccs. of sulphuric acid (this causes heat and change of colour) of specific gravity 1 82 (equal to 90 per cent, of real sulphuric acid), and turn immediately the machine at a high rate of speed for seven minutes, then fill the bottle up to the neckthat is, 40 to 50 ccs. — with hot water, and whirl for another minute Stand the bottle upiight in water kept at 55' C for a few minutes, and read off the per cent, of fat. Calculations : Each division '04 ccs. = 2 per cent of fat. If Ifgr of milk be used, and the temperature be 55 C at this temperature, the specific gravity of fafc is "9. Had.— You are not bound to pay for what you did ask for and did not receive. ' Old Subscriber.— The law of New Zealaud a3 j regards landlord and tenant differs from the law of England in this, that in New Zealand "implied tenancy from year to year by payment of rent" is abolished, .and "any tenancy not exceeding one year" may bs created by agreement in writing or by parole, and if there is a tenancy and no such agreement as to its duration it shall be deemed and held to be a tenancy determinable by one .month's notice in wiiting. It seems therefore that a tenant cannot rely upon the payment and acceptance of rent, but must have a definite agreement as to the continuance of the tenancy. H.— A trade mark may be registered for particular goods or classes of goods. Separate trade marks are necessary for good 3or manufactures of

essentially different kind 3. One person may have a series of trade marks having a general rt^emblauce in the material particulars, but diffeiing in respect to the clubs of goods for which they are used. Tr^de marks may bo registered at the Supreme Court offices. The fees are 5s for application aud £1 for legw'ration of tiade mark for one class of articles. Registration gives a lUht to th« exclusive use of the trade mark.