Universal Exposition Paris, Volume 21891 |
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Results 1-5 of 88
Page 9
... cent . act has become especially vicious . It has created and encouraged the production of bogus pictures , and it indirectly assists a newly fostered set of knaves to cheat the ignorant . We may search in vain the history of west- ern ...
... cent . act has become especially vicious . It has created and encouraged the production of bogus pictures , and it indirectly assists a newly fostered set of knaves to cheat the ignorant . We may search in vain the history of west- ern ...
Page 187
... cent surveys , and executed in relief . There are the remains of the ancient canal and the course of the new one . Excellent as are the United States exhibits in this class , we regret that so few who excel in this kind of work have ...
... cent surveys , and executed in relief . There are the remains of the ancient canal and the course of the new one . Excellent as are the United States exhibits in this class , we regret that so few who excel in this kind of work have ...
Page 296
... cent . 12.50 Per cent . 20.00 Per cent . 17.50 Per cent . 37.50 Exempt . Exempt . Exempt . Exempt . Austria . 12.50 20.00 17.50 37.50 Belgium 10.00 10.00 10.00 10.00 Brazil . 25.30 85.20 Denmark 17.50 46.80 46.80 93.60 Spain 26.58 26.58 ...
... cent . 12.50 Per cent . 20.00 Per cent . 17.50 Per cent . 37.50 Exempt . Exempt . Exempt . Exempt . Austria . 12.50 20.00 17.50 37.50 Belgium 10.00 10.00 10.00 10.00 Brazil . 25.30 85.20 Denmark 17.50 46.80 46.80 93.60 Spain 26.58 26.58 ...
Page 328
... cent . over the best Argand burners is claimed for this system . The following figures show the total gas production in France for the past eleven years , in cubic metres : 1878 . 1879 . 1880 . 1881 . 1882 .. 1883 . 430 , 700,000 ...
... cent . over the best Argand burners is claimed for this system . The following figures show the total gas production in France for the past eleven years , in cubic metres : 1878 . 1879 . 1880 . 1881 . 1882 .. 1883 . 430 , 700,000 ...
Page 405
... cent . benzole . Solvent naphtha , 90 per cent . Heavy naphtha ... Crude carbolic acid . Creosote oil .. Anthracene Pitch and loss . [ Per cent . on tar . ] Analysis of tars from- Carves Simon- Carves ovens . * ovens.t Per cent . Per ...
... cent . benzole . Solvent naphtha , 90 per cent . Heavy naphtha ... Crude carbolic acid . Creosote oil .. Anthracene Pitch and loss . [ Per cent . on tar . ] Analysis of tars from- Carves Simon- Carves ovens . * ovens.t Per cent . Per ...
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Common terms and phrases
alloy aluminium aluminium bronze American ammonia apparatus artist beautiful Belgium bleaching bronze carbon cast cent centimetres chemical chemistry chiefly chloride color composition contained copper crucible crystals decorative display distillation drawing dyeing employed England excellent exhibit exhibitors EXPOSITION OF 1889-VOL extraction fabrics feet firm flax flues France French furnace furnished gases glass gold medal grand prize heat hydrochloric acid hydrogen sulphide important inches industry instruments interesting iron kilogrammes laboratory Leblanc process lime machine manganese manufacture material ment Messrs metal method metres millimetres models nickel obtained oleic acid operation oxide painter painting PARIS EXPOSITION patent placed Plate porcelain portrait potassium potassium chloride pounds prepared present production pyrites quantity remarkable represented retting Salindres salt shown silk silver soap soda sodium specimens steam steel sulphate sulphuric acid telescope temperature tion tons tube various zinc
Popular passages
Page 473 - ... that temperature, but undergoes incipient fusion at 730°. According to Faraday, aluminium ranks very high among metallic conductors of heat and electricity, and he found that it conducted heat better than either silver or copper. The specific heat is also very high, which accounts for length of time required for an ingot of the metal to either melt or get cold after being cast. Chemically, its properties are well worthy of study. Air, either wet or dry, has absolutely no effect on aluminium...
Page 460 - ... described. In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.
Page 455 - ... extraordinary care ; in fact, not so much as is required in working many other kinds of charges, the composition of the resulting steel being easily and definitely controlled.
Page 467 - ... an air-tight joint which prevents the escape of gas and vapour from the vessel during reduction, except by the hollow arm provided for this purpose. The natural expansion of the iron vessels is accommodated by the water-pressure in the hydraulic lifts, so that the joint of the cover and crucible are not disturbed until it is intended to lower the lift for the purpose of removing the crucible. The length of time required for the first operation of reduction and distillation is about two hours....
Page 467 - The successful working of this process marks an era in the production of sodium, as it not only has greatly cheapened the metal, but has enabled the manufacture to be carried out upon a very large scale with little or no danger. Practically, the process consists in heating fused caustic soda in contact with carbon whilst the former substance is in a perfectly liquid condition. By the process in vogue before the introduction of this method, it was always deemed necessary that...
Page 466 - ... of double chloride should be annually manufactured, but in addition that each of these materials should be produced at a very low cost, in order to enable the metal to be sold at 20 shillings per pound.
Page 470 - ... the metal thus obtained required to be refined. This was successfully accomplished by Mr. Castner and his able assistant, Mr. Cullen, and for some time all the metal made was refined, the iron being lowered to about 2 per cent. The process, however, was difficult to carry out, and required careful manipulation, but as it then seemed the only remedy for effectively removing the iron, it was adopted and carried on for some time quite successfully, until another invention of Mr. Castner rendered...
Page 469 - ... mains, &c., this being the only available metal which withstands the corrosive action of chlorine. The gasometers are filled in turn from the stills, the chlorine consumed being taken direct from a gasometer under a regular pressure until it is exhausted ; the valves being changed, the supply is taken from another holder, the emptied one being refilled from the still. Manufacture of the Double Chloride. Twelve large regenerative gas furnaces are used for heating, and in each of these are fixed...
Page 466 - Chemists of many lands have contributed to our knowledge of the metal aluminium. Davy, in 1807, tried in vain to reduce alumina by means of the electric current, Oerstedt, the Dane, in 1824, pointed out that the metal could be obtained by treating the chloride with an alkali metal; this was accomplished in Germany by...
Page 467 - The residue is cleaned out. and the hot pot being again gripped by the tongs is taken back to the furnace. On its way the charge of alkali and reducing material is thrown in. It is again placed on the lift and raised in position against the edges of the cover. The time consumed in making the change is...