recommend to read with us a, little from Sir Isaac New- width of the slit can be altered, and the position of the ob- numerable circles then obliterates the circular form, except ton’s ‘‘ Opticks,” the work in which the foundations of our serving telescope and of the prisms can be adjusted so that… … other difficulties prevent our going very far KIRCHHOFF’S SPECTROSCOPE. whilst I viewed it, I held it and the Prism in this direction, and in some of the most before a window in such manner that the powerful instruments recently made the disposition has sides of the paper were parallel to the…
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