in the calcination by the notion that it is necessary to raise it, like quicklime, to a high temperature. The The latter gear is moved by a consequence is that the commercial plaster is burned hand lever extending upward through the platform, very much at random in kilns, which deliver one por-… … be somewhat less than that of boiling water, and it blast being readily adjustable for the purpose of plac- should never much exceed it, or the resulting plaster ing the dust in windrows at one side or blowing it toa distance from the road. The bellows has a supple- will be overburned and inert. As…
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