By Bernard D. Bolas
Excerpt from A instruction manual of Laboratory Glass-Blowing
To hide the total box of glass-blowing in a small guide will be very unlikely. to try even an entire define of the equipment utilized in making advertisement equipment could contain greater than can be undertaken with no omitting the basic information of manipulation beginner wishes. i've got, consequently, restricted myself so far as attainable to such paintings as will locate useful software within the laboratory and should, i'm hoping, turn out of price to these whose pursuits lie therein.
The approach to therapy and a bit disjointed form of writing were selected exclusively with the view to economic climate of house with no the undue sacrifice of clearness.
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Additional info for A Handbook of Laboratory Glass-Blowing
Anneal slightly by smoking. Apart from the notes on page 20 with respect to the blowing of a suitable bulb on capillary tubing there is little to say in connection with the glass working making a plain thermometer. The size desirable for the bulb will be determined needed in by the bore of the capillary tube, the coefficient of expansion of the liquid used for filling, and the range of temperature for which the thermo- meter is intended. Filling may be carried out as follows : Fit a small funnel to the open end of the capillary by means of a rubber tube, and pour into the funnel rather be used more than enough of the than liquid to required to fill the bulb.
The a blowpipe appliances necessary are capable of giving a well-formed flame of about : six or eight inches in length, a wheel of from eighteen inches to three feet in diameter and having a flat rim of about three inches wide, and a device for rotating the wheel at a speed of about three hundred revolutions per minute. A made very satisfactory arrangement may be from an old bicycle the back wheel ; having the tyre fastened on in removed and a its place. flat The rim of chain tin drive be retained, but one of the cranks removed and a handle substituted for the should remaining pedal.
Making It substance at The this important contrivance the glass rod must be kept hot byworking while it is actually in the flame, and that the skeleton must be made as thin as LABORATORY GLASS-BLOWING 28 possible with the avoidance of heavy masses of glass at any place. If these details are neglected it will be almost certain to crack. usually made from glass rod, and no special instructions are necessary for their construction, except that the glass should be in a thoroughly fused condition Stirrers.
A Handbook of Laboratory Glass-Blowing by Bernard D. Bolas