be tinted by inserting colored In the ease of the radiometer the heat of the lantern plates of glass in the slide receiver. representing ether particles, will be seen to move up causes radiometer to revolve, so that it is seen in and down on the screen without advancing, but the In Fig. 14 is shown… … may be used. The The perforated card shown in the corner of the en- LTTHINOTTS FOTTNTAm. rings are coated on graving is inserted in the lantern, and a pencil of opposite sides with placed a piece of wrinkled window glass, which is light is allowed to fall on the mirror, and when dif- shellac…
