Perkins, Henry, 1803-1889, publisher., Haswell, Barrington, and Haswell, printer., McManus-Young Collection (Library of Congress) · Philadelphia : H. Perkins, 134 Chestnut Street, MDCCCXXXVIII [1838] · leaf 57
thickness and colour. TO LOOK AT THE SUN WITHOUT INJUQY. Provide a wine-glass filled with plain water, which will keep off the heat so effectually, that the brightest sun may be viewed some time through it without any inconvenience. If a little black ink be added to the water, the image of the sun… … which can be obtained from quicksilver, or = the most highly-polished metals. OPTICAL ILLUSION UNDER WATER. Procure a large gallipot; place on the bottom, next the side furthest from you, a sixpence, and next toit, but towards the centre,
Juvenile literature · Scientific recreations
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