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Seite 66 - We now, therefore, witnessed, for the first time, the curious phenomenon of the directive power of the needle, becoming so weak as to be completely overcome by the attraction of the ship ; so that the needle might now be properly said to point to the north pole of the ship.
Seite 237 - VEGETABLE MATERIA MEDICA of the United States ; or Medical Botany : containing a Botanical, General, and Medical History of Medicinal Plants, indigenous to the United States ; illustrated by coloured Engravings, made after original Drawings from Nature, done by the Author.
Seite 152 - ... cubic inches ; and that correct standards of this imperial gallon, and of the bushel, peck, quart, and pint, derived from it, and of their parts, be procured without delay for the Exchequer, and for such other offices in your Majesty's dominions, as may be judged most convenient for the ready use of your Majesty's subjects. 4. Whether any further legislative enactments are required, for enforcing a uniformity of practice throughout the British empire, we do not feel ourselves competent to determine...
Seite 78 - Elements of the Philosophy of Plants ; containing the Principles of Scientific Botany, Nomenclature, Theory of Classification, Phytography, Anatomy, Chemistry, Physiology, Geography, and Diseases of Plants ; with a History of the Science, and Practical Illustrations ; by AP Decandolle and K.
Seite 152 - Fahrenheit, is 252,72 grains of the parliamentary standard pound of 1758, supposing it to be weighed in a vacuum. We beg leave therefore finally to recommend, with all humility, to your Majesty, the adoption of the regulations and modifications suggested in our former reports, which are principally these : — 1. That the Parliamentary standard yard, made by Bird in 1760, be henceforward considered as the authentic legal standard of the British Empire ; and that it be identified by declaring...
Seite 71 - We found it necessary, therefore, to use great caution in handling our sextants and other instruments, particularly the eye-pieces of the telescopes, which, if suffered to touch the face,5 occasioned an intense burning pain ; but this was easily remedied by covering them over with soft leather. Another effect, with regard to the use of instruments, began to appear6 about this time.
Seite 88 - Ampere's elaborate treatise on the electro-magnetic phenomena, I have passed the electrical shock along a spiral wire twisted round a glass tube containing a bar of steel, and I found that the bar was rendered powerfully magnetic by the process. • Without meaning to offer any decided opinion on that gentleman's ingenious views, I shall beg permission to mention two circumstances, which seem to me unfavourable to the idea of the identity of electricity and magnetism ; 1st, the great distance to...
Seite 71 - It now became rather a painful experiment to touch any metallic substance in the open air with the naked hand ; the feeling produced by it exactly resembling that occasioned by the opposite extreme of intense heat, and taking off the skin from the part affected.* We found it necessary, therefore, to use great caution in handling our sextants and other instruments, particularly the eye-pieces of the telescopes, which, if suffered to touch the face,5 occasioned an intense burning pain ; but this was...
Seite 83 - ... all arrangements of needles transversely round the wire, all the needles above had north and south poles opposite to those below, and those arranged vertically on one side, opposite to those arranged vertically on the other side. I found that contact of the steel needles was not necessary, and that the effect was produced instantaneously by the mere juxta-position of the needle in a transverse direction, and that through very thick plates of glass : and a needle that had been placed in a transverse...
Seite 84 - I found was the case, on placing very small needles across a fine wire connected with a prime conductor of a powerful machine and the earth. But as a momentary exposure in a powerful electrical circuit was sufficient to give permanent polarity to steel, it appeared equally obvious, that needles placed transversely to a wire at the time that the electricity of a common Leyden battery was discharged through it, ought to become magnetic ; and this...