Elementary chemical microscopy (1921) Elementary chemical microscopy . elementarychemi00cham Year: 1921 MICRO-BURNERS 155 convenient. The usual form employed in blowpipe analysis provided with a platinum tip should be chosen and if in addition it can be fitted with a hot-blast attachment its usefulness will thereby be greatly increased. Where the work table is supplied with compressed air a minia- ture blast lamp of the type shown in Fig. 88 is an invaluable aid in fusions, production of high temperatures, preparation of tiny blown glass apparatus, etc.; having two joints it can be quickly ad
Elementary chemical microscopy (1921) Elementary chemical microscopy . elementarychemi00cham Year: 1921 MICRO-BURNERS 155 convenient. The usual form employed in blowpipe analysis provided with a platinum tip should be chosen and if in addition it can be fitted with a hot-blast attachment its usefulness will thereby be greatly increased. Where the work table is supplied with compressed air a minia- ture blast lamp of the type shown in Fig. 88 is an invaluable aid in fusions, production of high temperatures, preparation of tiny blown glass apparatus, etc.; having two joints it can be quickly adjusted to almost any position and can even be employed to heat material directly under the microscope, although such oper- ations are best performed by means of an electric current since the heat may thus be far better localized. Heating preparations while subjecting them to observation through the microscope may be accomplished by means of the electrically heated hot stage (see page 222) or by a tiny flame obtained from a glass or quartz tube drawn out and bent up and supported by the substage ring of the instrument, the rotating stage having been removed to avoid injury and the preparation supported on an asbestos plate provided with a small central orifice for the passage of light. It is obvious that when moderately high powers and tem- peratures are to be employed, the objectives must be kept cool either by means of a strong blast of cold air or by water jackets. To meet these conditions specially constructed microscopes are obtainable; a typ- ical instrument of this sort is shown in Fig. 29, page 71. Small Tongs. — As a substitute for crucible tongs for holding plati- num foil, cups, etc., a pair of com- pression arterial forceps, Fig. 89, will be found to be a valuable addition to the equipment. Forceps of this sort hold thin Fig. 89. Surgical Compression Forceps. Convenient for Hold- ing Small Platinum Cups or Pieces of Foil.
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