Tar and Resin Compounds, lamp behind this glass receiver. I will send a beam of light vert its water into vapor, and this vapor is carried up into through the receiver, and let it fallon the screen. At first the air. What is the consequence? I want to show youone Compositions having tar and resin… … allow it to expand, then the expansion of theair done, the composition may be put upon blocks, and upon structures, warm, with a brush. On metal, it should be put on produces cold. I willshow you one effect of this expansion of air. I have here condensed ina warm day, or better, ina warm room,with…
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