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Published online by Cambridge University Press: 05 July 2011
Previous to the celebrated eclipse of 1858, the Astronomer Eoyal circulated a useful series of suggestions, which we here reproduce, in a slightly amended form, as applicable to other eclipses besides the one above referred to: —
“ The following suggestions are offered as presenting grounds for consideration, which may tend to direct observers ia deciding on the employment of the means which they may possess.
“ I. Observations not requiring Instruments.
“ 1. As the eclipse advances, it is desirable to obtain some notion or measure of the degree of darkness.
“ 2. At what distance from the eye can a book or paper, exhibiting type of different sizes, be read?
“ 3. Hold up a lighted candle nearly between the Sun and your eye. At how many sun-breadths' distance from the Sun can the flame be seen?
“ 4. If you are in an elevated position, remark the changes of colour and appearance of the surrounding objects in the landscape.
“ 5. If you see the spots of light formed by the intersecting shadows of the boughs of trees, remark whether they exhibit the lunefonn of the Sun.
“ 6. When the annulus is formed, you will probably observe it with a darkened glass; but you are particularly requested to devote one instant (as early as possible) to the verification of this point, viz.: When the annular Sun is viewed with the naked eye, does it appear an annulus or a fully illuminated disc?
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