Robinson thomas rodney (2 Ergebnisse)

(London, Harrison and Sons, 1879). 4to. No wrappers as extracted from "Philosophical Transactions" 1879 - Vol. 169 - Part II. Pp. 777-822 a. 5 plates. First printing of Robinson's new experiments and researches into the constants of the Cup-Anemometer which he invented in 1846 by modifying Whewell's instrument by the introduction of the now-familiar windmill with hemispherical cups."A simple type of anemometer is the cup anemometer, invented (1846) by Dr. John Thomas Romney Robinson, of Armagh Observatory. It consisted of four hemispherical cups each mounted on one end of four horizontal arms, which in turn were mounted at equal angles to each other on a vertical shaft. The air flow past the cups in any horizontal direction turned the cups in a manner that was proportional to the wind speed. Therefore, counting the turns of the cups over a set time period produced the average wind speed for a wide range of speeds. On an anemometer with four cups it is easy to see that since the cups are arranged symmetrically on the end of the arms, the wind always has the hollow of one cup presented to it and is blowing on the back of the cup on the opposite end of the cross.".…

(London, Taylor and Francis, 1870). 4to. No wrappers as extracted from "Philosophical Transactions" 1869 - Vol. 159 - Part I. Pp. 127-161 and 10 lithographed plates, showing the telescope and its parts. A few small weak brownspots to top of some plates. First printing of the detailled description of the Great Melbourne Telescope, by Robinson, member of the commitee and Thomas Grubb, the constructor. With it a number of importent observations of Nebulae were carried out. For 20 years it was the largest in the world, and it was the first instrument to document gravitational lens light refraction. The telescope was destroyed during the bush fires of January 2003."The construction of the grand instrument was entrusted to Mr. Grubb, F.R.S., of Dublin, Ireland. At the Commencement of the year 1868 the telescope was completed, and examined by the Commitee of the Royal Society, made up of Lord Rosse, Dr. Robinson and Warren de la Rue. Intheir report they expressed their opinion that the equatorial was a masterpiece of astronomical mechanism.".…