It
shows a pair of spectacles in their leather case; an awl and a saw,
with the iron stem, plainly visible through the wooden handles; a
magnifying-glass; and a combination wooden tool-handle with metallic
tools stored in the head, and the metallic clamp visible through the
lower half.]
The next step was to bring more energy into play, still using Leyden
jars; and for this purpose Dr. Morton placed within the circuit
between the jars a Tesla oscillating coil. He was thus able to use in
his shadow pictures the most powerful sparks the machine was capable
of producing (twelve inches), sending the Leyden-jar discharge through
the primary of the coil, and employing for the excitation of the
vacuum tube the "step up" current of the secondary coil with a
potential incalculably increased.
While Dr. Morton has in some of his experiments excited his Leyden
jars from an induction coil, he thinks the best promise lies in the
use of powerful Holtz machines; and he now uses no Leyden jars or
converters, thus greatly adding to the simplicity of operations.
In regard to the bulb, Dr. Morton has tested various kinds of vacuum
tubes, the ordinary Crookes tubes, the Geissler tubes, and has
obtained excellent results from the use of a special vacuum lamp
adapted by himself to the purpose.
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