nder the key than those in common use. The construction avail themselves of their investi .rations; but there fire box, which will shut off the hot air and admit a and operation of this key can be seen by the accom- is no reason why similar associations on a smaller current of cold air at will,… … consisted in running the coffee through black lead, tirough the flues and discharges it through the Back, M. which gave to it a shiny metallic appearance. Fig. 1 represents the key perfect. In Fig. 3 will The report published in the Scientific American Tt is claimed that this evaporator has every…
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