The Methods of Glass Blowing for the Use of Physical and Chemical Students, for W.A. Shenstone ...

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Page 59 - ... into the form of a delivery tube. It will then be possible to break the tip of this under a cylinder in a trough of liquid. In order to explain the construction of apparatus consisting of several parts, it will be sufficient to take as examples, two very well-known instruments, and to describe their construction in detail. From what is learned in studying these, the student will gather the information that is wanted. 1. To make Hofman's Apparatus for the electrolysis of water (Fig.
Page 34 - In that case apply a pointed flame at b, and repeat the. previous operation so as to contract the tube as at c, taking care not to allow the glass to become much increased nor decreased in thickness If a considerable mass of glass be left at d, it may be removed by heating it to redness, touching it with the pointed end of a cold glass tube, to which it will adhere, and by which it may be pulled away. When the end of the tube...
Page 33 - When this occurs, the narrow part is heated till it melts and the ends pulled asunder. The closed end should present the appearance shown at D If a considerable mass of glass be left at d, it may be removed by heating it to redness, touching it with the pointed end of a cold glass tube...
Page 33 - ... in the smoky flame of a blowpipe for a few minutes. The blast is then turned on slowly, and the tube, while held in one hand at an angle of 45, heated at the end until softening takes place, when a previously warmed glass rod held in the other hand is fused on to it.
Page 58 - In order to secure a thick end to the point of the capillary a, about 2 cms. of the tube at the shoulder is warmed a little at the moment of finally sealing it ; the contraction of the air in the tube, in consequence of its cooling, ensures the glass at a running together to a solid end when it is melted in the flame. If it is desired to collect a gas produced during the chemical reaction, the capillary is made several inches long, and is bent into the form of a delivery tube. It is then possible...
Page 27 - Make a scratch with a file, and touch it with the end of a very small piece of glass drawn out and heated at the tip to its melting-point.
Page 15 - Hard glass, which contains much calcium, is more apt to devitrify than the more fusible varieties.

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