By Bernard D. Bolas
Excerpt from A guide of Laboratory Glass-Blowing
To conceal the entire box of glass-blowing in a small instruction manual will be very unlikely. to aim even an entire define of the equipment utilized in making advertisement equipment may contain greater than may be undertaken with out omitting the fundamental info of manipulation amateur wishes. i've got, consequently, limited myself so far as attainable to such paintings as will locate functional software within the laboratory and may, i'm hoping, turn out of price to these whose pursuits lie therein.
The approach to remedy and just a little disjointed variety of writing were selected completely with the view to financial system of area with out the undue sacrifice of clearness.
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Additional resources for A Handbook of Laboratory Glass-Blowing
Mercury or alcohol will be used in practice, most probably. Warm the bulb until a few air is LABORATORY GLASS-BLOWING 45 bubbles have escaped through the liquid and then allow to cool. This will suck a certain amount of liquid into the bulb. Now heat the bulb again, and at the same time heat the capilThe liquid lary tube over a second burner. will boil and sweep out the residual air, but it necessary to heat the capillary tube as well Allow the in order to prevent condensation. bulb and tube to cool, then repeat the heating is once more.
Is illustrated sufficient by a, This, Fig. in 12. its simplest Such a form, although highly satisfactory in action, needs constant watching while in action, as should mercury funnel become empty air will the exhausted vessel. Obviously, the fall-tube must be made not less than thirty the enter 4 LABORATORY GLASS-BLOWING SO the measurement being taken long from the junction of the exhaustion branch inches ; with the fall-tube to the top of the turned-up end. (V-Q \\ VJ I m a s Fig. A 12 MacLeod Pump.
8. The be mercury, petroleum, or any other that the liquid used in this seal experimental conditions indicate. If the bearing for a stirrer is tube, it is made of glass desirable to lubricate rather freely ; LABORATORY GLASS-BLOWING 29 otherwise heat will be produced by the friction of the stirrer and the tube will probably crack. Such lubrication may be supplied by turning out the top of the bearing tube and filling the turned-out portion with petroleum jelly mixed with a small quantity of finely ground or, better, colloidal graphite, and the bearing should also LABORATORY GLASS-BLOWING 30 be lubricated with the same composition.
A Handbook of Laboratory Glass-Blowing by Bernard D. Bolas