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Updated: May 15, 2025
Its diminutive size struck M. de Borda, and other travellers, who took little interest in geological investigations.
"Let us hope you will be one soon, Monsieur Fred," said Dolly. "You will have well deserved it, according to the way you have distinguished yourself on board the 'Borda."
MECHAIN and DELAMBRE measured the angles of ninety triangles with the new reflecting circles; imagined by MAYER, and which BORDA had caused to be constructed.
I had scarcely entered the Observatory, when I became the fellow-labourer of Biot in researches on the refraction of gases, already commenced by Borda. While engaged in this work the celebrated academician and I often conversed on the interest there would be in resuming in Spain the measurement interrupted by the death of Méchain.
If the height of this volcano is 1905 toises, as the last trigonometrical measure of Borda indicates, its summit ought to be visible at a distance of 43 leagues, supposing the eye on a level with the ocean, and a refraction equal to 0.079 of distance.
The reflectors in general use measure over the tips twenty-one inches as applicable to stationary, and twenty-live inches for revolving lights. The Catoptric or reflecting system was first adopted under the direction of Borda, at the Corduan Lighthouse, probably about the year 1780.
Two hours afterward Cape Catastrophe was out of sight. In the evening they doubled Cape Borda, and came alongside Kangaroo Island. This is the largest of the Australian islands, and a great hiding place for runaway convicts. Its appearance was enchanting.
Among the mountains W. of Borda there is a peak more than 11,000 feet in height. SNELLIUS. A very fine ring-plain, 50 miles in diameter, S.E. of Petavius, with terraced walls, considerably broken on the S.E. by craters, &c. It rises on the E. nearly 7000 feet above a dark floor, which contains a central mountain.
"Young ladies," said Jacqueline, "I present to you a 'bordachien' a little middy from the practice-ship the Borda." They burst out laughing: "A bordachien! A middy from the practice-ship!" they cried.
There is a number of bright streaks in its neighbourhood; and a few miles E. of it, in the hilly region W. of Santbech, another conspicuous crater of about the same size. BORDA. A ring-plain about 25 miles in diameter, S.S.W. of Santbech, with a rampart low on the N. and S., but elsewhere of considerable height, and a very conspicuous central mountain.
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