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The philosophical magazine


The philosophical magazine

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    Available in PDF Format | The philosophical magazine.pdf | Unknown
    Alexander Tilloch
Excerpt from book: excess of the total arc is extremely small, as it Joes not Exceed l",3, so as to make but five or six toises difference iu the length of a degree observed on the meridian, and corresponding to the mean latitude of the arc examined. [To be continued.] VII. On (lie Differential Thermometer. To Mr. Tilloch. Sir, JL He simplest mode of settling the point in disput between Professor Leslie and Sir H. Davy, with regard to the invention of the differential thermometer, is to give! exact representations of Mr. Leslie's instrument, of Van. Helmont's, and of the figures Sir Humphry has given of them. Fig. 1. (Plate II.) is the differential thermometer of Mr. Leslie copied from the figure he gives of it in his work on Heat. Fiij:. 2. is the instrument of Van Helmont copied from the edition of his works 1648, and of which the figure in the edition 1652 is the same. Fig. 3. is the representation Sir H. gives of Van Helmont's instrument: and fig. 4. is that which he gives of Mr. Leslie's. No otid I suppose can look at these figures without perceiving that they are not correct representations thher of the one or of the other, but that both are essentially altered. The simpl question, and which one would imagine might be easily answered, is, Why were these alterations made? ' Instead of explaining this, a correspondent A. B. in youf journal for November has said, as affording a ground of justification of Sir Humphry, that in the figure of Van Helmont " there is no aperture delineated, and it might be conceived hermetically sealed." He adds, that in the representation Mr. Leslie gave of this instrument in your journal, he introduced a cork, and his figure differs from those in the two editions of Van Helmont, which are found in the library of the College of Edinburgh, and which an ...  
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  • PDF | 412 pages
  • Alexander Tilloch
  • General Books LLC
  • Unknown
  • 4
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