The Philosophical magazine; a journal of theoretical, experimental and applied physics . agree with the English one. Mr. Tuckett has prepared a new set of conversion-tables, basedon the hypothesis of the two scales having the same temperature,and has distributed them to several of the London makers, most ofwhom immediately recognized the inaccuracy of the method they hadbeen employing, and promised to correct it for the future. It is ofcourse desirable that the production of inaccurate barometers shouldbe stopped as speedily as possible, and I therefore venture to give aword of advice to jiurc
The Philosophical magazine; a journal of theoretical, experimental and applied physics . agree with the English one. Mr. Tuckett has prepared a new set of conversion-tables, basedon the hypothesis of the two scales having the same temperature,and has distributed them to several of the London makers, most ofwhom immediately recognized the inaccuracy of the method they hadbeen employing, and promised to correct it for the future. It is ofcourse desirable that the production of inaccurate barometers shouldbe stopped as speedily as possible, and I therefore venture to give aword of advice to jiurchasers. When a harometer is offered to you,set the vernier to 30 inches, and if the metrical reading should be 762millims., reject the instrument at once. I trust also that the matterwill not be lost sight of at Kew and Greenwich, and that barometerswith incorrect metrical scales will no longer be passed without com-ment when sent to those observatories for am. Gentlemen, Your most obedient Servant, 51 Carpenter Road, Edgbaston, William Mathews, Jun. December 12, THELONDON, EDINBURGH, and DUBLIN nilLOSOPHICAL MAGAZINE AND JOUllNAL OF SCIENCE. [FOURTH SERIES.] FEBRUARY 1865. XIV. All Account of some Electrical Experiments and Inductions. By J. J. A\ ATEKSTON, Esq.^[With a Plate.] IN the various forms of electric discharge and tlicir wondrousdiversity of phenomena, can we detect a dynamical conditioncommon to all—a single essential principle upon which the ces-sation of the excitement depends ? Light is a common pheno-menon attending discharge, having its origin therein; butthroughout nature generally liglit originates in molecules ofordinary matter: a beginning of the phenomena of light is neverunassociatcd with the material element, unless electric dischargebe an exception: yet it may not be an exception,since Fusinieri hasproved that metallic molecules are transj)orted from one conductorto the other when an electric spark is made to pass between
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