- 2. The frame, which is fitted to an optical lantern, tom, one-third full of water and incline it, as shown in corrode when subjected to the action of water and carries an opaque plate having a circular opening, be- further renders the material coated waterproof. The the engraving, so that the… … When they entered into their work in the field of art the Manufactures building at Chicago. It was a mat- Fig. 1—REFRACTION AND DISPERSION. ter of necessity that this alteration should be carried they would come under many influences, and it was out without interfering with the constant traffic of…
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