. end of the table. You rest your chin upon them, and laboratory apparatus. They are used mostly by min- eralogists for the study of the optical properties of then move the plate of glass until you can see the Cfte gbri$tma$ entertainment. luminous sky reflected on the glass under an angle… … the switch is thrown to put out the light in the for- paper. The The invisible printing is read easily through what appears to be common ward compartment, and to light the lamp in the rear intense light green glass. compartment, the other object only is seen through the reflected o n glass…
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