Proceedings of the Royal Irish Academy, Volume 3Royal Irish Academy, 1847 - Science Includes also Minutes of [the] Proceedings, and Report of [the] President and Council for the year, separately published 1965/66- as its Annual report. |
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Page 80 - ... the picture will appear confused from all parts being equally acted on. In all cases, the shorter the time in which the picture is taken the better. When the paper is removed from the camera no picture is visible. However, when left in the dark without any other preparation being used, for a period which varies with the length of time it was exposed, and the strength of the light, a negative picture becomes gradually developed, until it arrives at a state of perfection which is not attained,...
Page 120 - Dr. Robinson could not leave this part of his subject without calling attention to the fact, that no real nebula seemed to exist among so many of these objects chosen without any bias: all appeared to be clusters of stars, and every additional one which shall be resolved will be an additional argument against the existence of any such.
Page 82 - In the first place, the paper used should be that called wove post, or well-glazed letter paper. When the solutions are applied to it, it should not immediately imbibe them thoroughly, as would happen with the thinner sorts of paper. If the acid solution is too strong, it produces the very effect it was originally intended to overcome ; that is, it produces yellow patches, and the picture itself is a light brick colour on a yellow ground.
Page 277 - Variation of the Difference of the Squares of the Reciprocals of the Semiaxes of a Diametral Section.
Page 83 - Take of syrup of ioduret of iron, distilled water, each two drachms ; tincture of iodine, ten to twelve drops : mix. First brush this over the paper, and, after a few minutes, having dried it with the blotting paper, wash it over in the dark (before exposure in the camera) with the following solution, by means of a camel-hair pencil: — Take of nitrate of silver one drachm; pure water one ounce : mix.
Page 90 - ... the amounts from W. and S. are nearly equal, and both less than that from SWNW and SE are also equal, but still less ; and so on. There is one particular in which this separation of the gross amount of rain into the eight portions, as brought by different winds, may be useful ; viz., in ascertaining the respective specific gravities, and the amount of saline matter brought from each direction. This may be useful in regard to agricultural matters. For instance, we could easily suppose a case of...
Page 89 - on the amount of rain which had fallen, with the different winds, at Toomavara, Limerick, during five consecutive years," by the Rev. T. KNOX. Taking the average monthly rain at three inches, the first six months of the year are below the average, the other six months above it. November and July are by far the two wettest months in the year ; and in each the greatest amount of rain is from SW April is much the driest month ; and there is nearly as much rain in it from the northern portion of the...
Page 28 - OB=-)-m, we find the areas PAOY and QOBY both positive and infinite, which agrees with all our notions derived from the theory of curves. Again, if we attempt to find the area PYQB by summing PAOY and YOQB, we find an infinite and positive result, which still is strictly intelligible. But if we want to find the area by integrating at once from P to Q, we find, as above, - (2 : m), a negative result for the sum of two positive infinite quantities.
Page 82 - It produces yellow patches, and the picture itself is a light brick color on a yellow ground. When the tincture of iodine is in excess, partly the same results occur; so that if this effect is visible it shows that the oxide of silver which is thrown down is partly redissolved by the excess of acid and iodine, and their quantities should be diminished. On the contrary. If the silver solution is too strong, the oxide is deposited in the dark or by an exceedingly weak light, and in this case blackens...
Page 171 - O'Gorman in the year 1767- It states that' Michael de Cusack, lord of Portrane and Rathaldron, married Margaret Dexter, who brought him, as a marriage portion, the castle, town, and lands of Rathaldron. He was ' Greffier' [a term which Boyer translates ' Registrar,' or Keeper of the Rolls] of Westmeath and of Louth in 1553, one of the Barons of the Exchequer in 1580, and died in 1589...