Chicago.

Manawatu Herald, Volume III, Issue III, 22 October 1891, Page 3

Chicago.

WORLD'S FAIR NOTE *. The publishers of Puck, the well known comic paper, have been granted space, 50 by 100 feet, for a building on the Exposition grounds, in" which to show fully every detail of the process of editing and publishing a humorous paper. The first cotton gin, made by Eli Whitney, will be exhibited at the Exposition by the New Orleans Machinery Company, which will also make an extensive exhibit of cotton gins, sugar mills and other machinery. A genius at Muhlenberg, Pa., has completed a marvelous clock for exhibition at the Fair. Around the dial is a railway track, on which, a miniature locomotive makes the round every five minutes. It requires a magnifying glass to see the delicate machinery. The oil cups at the journals are so small that nothing larger than a hair can be inserted. There is a headlight and bell, flag-holders on the pilot, whistle and everything connected with a locomotive. It has a link motion under the engine to reverse it. The weight of the locomotive is 1£ pounds and it has been named " The Gem." A magnificent microscope has just baen completed by the Munich # Poeller Physical and Optical Institute for the great Chicago Exposition, at a. cotAoi $8,760. It possesses a magt^ng power of 1 1 ,000 diameters. As might b 3 expected, electricity plays an important part in the working of this gigantic instrument, which, after inspection by American citizens, ia expected to give an impetus to the. Munich mart for scientific apparatus. The elootricity furnishes and regulates the source of light, which, placed in the focus of a , parabolic aluminum reflector reaches an intensity of 11,000 candle power, The electricity abo provides the means of an ingenious .automatic mechanism for the centering of the quadruple condensers and illumin- * ating the lenses. There is an arrangement for the exact control of , the distance of the carbon point. The most important novel feature is | the cooling machine, which is indis- 1 s)ensable on account of the extreme leat, 1-48 calories per second, generated by the intense illuminating arrangement. A machine regulated by a Helmhotz electric centrifugal regulator provides the several microscopic and polariscopic systems of the apparatus with a fine spray of fluid 'carbonie acid, which immediately after its release from the copper vessel, in which it is held under a pressure of 28 atmospheres, becomes converted into gascons matter, so intensely cold that only .00007 grammes of carbonic acid per second is required to give the result. The magnifying power of the apparatus with ordinary objectives, as has been stated, is about 11,000 diameters, but with the oil immersion it can be increased to 16,000.