The Repertory of Arts and Manufactures Volume . 12

The Repertory of Arts and Manufactures Volume . 12

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1800 edition. Excerpt: ... by the mercury; but, towards the end of the operation, a border of mercury, which indeed appeared rather roundish, might be seen-rising around the plate. r-'. T H The lower surface of the plate had eiren carried away, in separating itself, ten or twelve very small globules of mercury, some of which, that projefiled the least, formed a realidrop, of the nature of those which penetrate the bodies to which they adhere. I The plate of platina having been weighed in this state, and again after ha'ing been heated to a white heat, the difference was found not to amount to 7 milligrammes. The result of this experiment fixes the place of platina (in the table of adhefion of metals to mercury) between bismuth and zinc. The property of platina, of supporting the greatest degree of heat without becoming oxidated, and even without losing its polith, suggested to me the.-"idea of trying whether the ad'hefion of platina to mercury would not be increased by heating the platina to a white heat, and and in that state applying it to the mercury, as the cohefion of the particles of the platinia 'to each other would then naturally be more weak: I found, however, that when 'the platina was in this state, I could not charge the oppofite scale with so much as 58 decigrarnmes (as in the firfl; experiment) before the separation took place. This think ought perhaps to bl-, attributed to the imposfibility of cleaning the surface of 'the platina, before its application tothc nuercury; for 'the ddiminution of the power of cohefion pro duced, in-other respeets, a very sensible difference; namely, that the platina appeared to be acS'ted upon by the mercury, and some drops, adhered to it; they, however, separated from it pretty eafily, 4. 4 T ' ', and more more

Product details

  • Paperback | 66 pages
  • 189 x 246 x 4mm | 136g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236627032
  • 9781236627032