The part of the tube above this point will gradually bend
over of its own weight as the glass softens. When it reaches the
angle of about 60 deg., Fig. 6, take hold of the tube with the
right hand still keeping the flame on the tube, and gradually draw
the softened portion out until it separates from the main tube.
The tube is now finished and when the platinum wires are attached
to the terminals of a spark coil a beautiful blue light will
appear in the tube with a dark space at the negative end or
cathode.
--Contributed by David A. Keys, Toronto, Can.
** Loosening Rusted Nuts [155]
Nuts that are rusted fast can often be loosened by giving a hard
turn in the tightening direction.
** Cleaning Greasy Stoves [155]
Greasy stoves may be cleaned with a strong solution of lye or
soda.
** How to Make a Take-Down Background Frame [156]
Many amateur photographers who desire to do portrait work at home
have left the subject alone for the want of a suitable background.
A frame such as is used by the professional is entirely out of the
question in most homes, says a correspondent of Camera Craft.
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