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New Zealand Herald, Volume XXIII, Issue 7647, 26 May 1886, Page 3

" Invincible" Pfmps.— The other day I paid my first visit to Liverpool. My object was to witness the trial of a set of " Invincible" Pumps constructed by Messrs J. and H. Gw.nne, of Hammersmith, for the Mersey Docks and Harbour Board. It appears that the Board had called upon its engineer, Mr. Lyster, to increase the depth of water within the Sandon Duck, which is one of the old onus, and over the sills of the graving docks which join it, so as to admit of the entry at low neap tides, of vessel* at present barred at such times by want of water ; alia to improve the existing system of drying the Sandon Graving Docks—six in number—and the Huskhsoa Dock, the old appliances having beccma absolete and worn out. Mr. Lysier had to consider whether ha should solve the question by deepening the dock or by pumping water into it. The former process Involved great expense and unavoidable delay, and, for certain reasons connected with foundations, neither the expense nor the dolay could be accurately forecast; therefore he advised the Board to pump. The result was a contract for five " Invincible" Pumpe, four of which have motion pipes Sβ inches in diameter, and arc intended for raising the water la the dock ; while the fifth has ■ 15-inch suction pipe, and is to be used for dealing with leakage from the graving docks. The task the contractors had to perform was this—they had undertaken to raise the level of the water in Sandon Deck five feot in three hoars; what they did was to raise it that height in one hour and thirty minutes. It w»s found that the maximum combined disubaige of the four large pumps was 23,997 cubic feet, equal to 085-6 tons per minute at the pressure of 80:b, and this performance exceeded the requirements by about 50 per cent. Now, for the benefit of non-experts like myself, 1 will try to explain, what this pumping feu ro»l!y means. The S«ndon Dock measures ion acres- An inch of water spread over the surface of one acre is equal in weight to 100 tons, and therefore over ten acres to 1000 tons. There are sixty inches in fivo feet, and therefore five feet of water in Sandon Dock means 60,000 tons. These 60,000 tons were pumped in in an hour and thirty minutes, equal to 40,000 tons per hour. All engineering is more or less a question of coal, and the coal consumed in lifting the-.e 60,000 tons was 34cwt. Pursuing this calculation it will be found that 38081b of co*l were useu in putting sixty inches of water over ten acres. Divide 38081b by sixty, the number of inches, and we havi> (islb as the coal expended in putting one inch into the 'lock. Divide this again by ten, the number of acres, and we find that 6'3lb of coal suffice with the " Invincible" pump* to put one inch of water on an acre.—Kalrplay. The Best Medicine known is Sander and Sons' Btcalypti Extra err.—Test it» eminent powerful effects in coughs, colds, influenza; the relief is initanUneous. In serious cases and accidents of aV. kinds, be they wounds, burns, scaldjngs, bruises, gp.*ains, it is the safest remedy-no swelling— no inflammation. Like surprising effects produced in. croup, diphtheria bronchitic, inflammatien of the lungs, sellings, Ac, diarrhoea, dysentery, diseases of the kidneys and urinary organs. In use at Uospitals and medical clinics all over the globe ; patronised by His M«e»ty the King of Italy; crowned with medal and diploma at International Exhibition, Amsterdam. Trust in this approved article, and reject all othejs. For £6 yon can furnish a, bedroom with one double iron or wood bedstead, tnattrass, palliass boater, two pillows, wastutand, full set chamberwire, Ohiua niacins .toilet glass, chest drawers, and cine-teited chair, at Garllck and Crauwells, house* fimiehers, Queen-street, Auckland.