Handbook of Natural Philosophy volume 4

Cover Handbook of Natural Philosophy volume 4
Handbook of Natural Philosophy volume 4
Dionysius Lardner
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In p' there is a wider vertical slit, along which is stretched vertically a thin wire. The eye placed at o looks through the two slits, and turns the instrument round its support until the object of observation is intersected by the vertical wire, extended along the slit p'. Provisions are made in the instrument by which the direction thus observed can be ascertained relatively to that of the needle. The angle included between the direction of the observed object, and that of the needle, is the... bearing of the object relativelv to the needle.
The compass box is suspended within the hoop e e', at two points z z' diametrically opposed, and the hoop e e' is itself suspended within the fixed hoop c c', at two points x x', also diametrically opposed, but at right angles to 2 2'.
The ordinary mariner's compass enclosed in its case, called a binnacle, is shown in fig. 313. , where K is a plate of ground glass for the purpose of Fig. Jij.
admitting light to the instrument at night. A strong lamp with a reflector is placed opposite this, by which the interior of the box is illu- minated, and the light is reflected to a plate of talc, or other semi-transpa- rent substance, on which the divisions of the compass are marked.


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