. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. A piece of thin glass (6), attached to a small brass milled head (fig. 3), fits into the side of an adapter (fig. I) ; and when in po- sition, as in figs. 1 and 2, the light coming through a small circular aperture (a) may be reflected down and through the object-glass by the thin glass, which makes no obstruction to the rays of light passing upwards again from the object-glass to the eye-piece, nor even affects the definition to any perceptible degree. The adapter (fig*. 1) i
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. A piece of thin glass (6), attached to a small brass milled head (fig. 3), fits into the side of an adapter (fig. I) ; and when in po- sition, as in figs. 1 and 2, the light coming through a small circular aperture (a) may be reflected down and through the object-glass by the thin glass, which makes no obstruction to the rays of light passing upwards again from the object-glass to the eye-piece, nor even affects the definition to any perceptible degree. The adapter (fig*. 1) is used, as shown in section (fig. 2), between the nose-piece (c) and the object-glass {d.) ; it has a rotating fitting at the milled ring; and this movement, in combination with that of the small milled head to which the thin glass is attached, is sufficient for the nicest adjustment of the illumination. By means of a slot {e, fig. 1) in the side of the adapter, the thin glass may be readily removed for the purpose of being wiped, as its perfect freedom from dust or smear is most essential. * Silliman's Journal, September Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original London, Taylor and Francis, Ltd
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Keywords: ., bookce, booksubjectbotany, booksubjectgeology, booksubjectzoology
