Journal of the Franklin Institute; devoted to science and the mechanic arts (1826)
Franklin Institute (Philadelphia, Pa.) · Oxford, Eng. [etc.] Pergamon Press [etc.] · leaf 265
a piece of glass beyond the temperature requisitefor the result to be obtained. 2. Never to work a piece of glass when damp. 3. Never to transfer a piece suddenly from cold air to the flame,or, vice versa, but to remove it from the flame gradually, in order toanneal it. 4. To keep the piece… … On the Art of Glass Blowing. 259 6. To turn the pieces round continually in the flame, when theirform allows it, and always in the same direction. 7. Never to inflate the bladder from the lungs, but with the airwhich the cheeks when inflated can contain, and which furnishes al-ways an adequate…
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