and post in the community, by means of ultronic broadcast.
Everywhere I was welcomed in an interested and helpful spirit.

I visited the plants where ultronic vibrations were isolated from the
ether and through slow processes built up into sub-electronic,
electronic and atomic forms into the two great synthetic elements,
ultron and inertron. I learned something, superficially at least, of the
processes of combined chemical and mechanical action through which were
produced the various forms of synthetic cloth. I watched the manufacture
of the machines which were used at locations of construction to produce
the various forms of building materials. But I was particularly
interested in the munitions plants and the rocket-ship shops.

Ultron is a solid of great molecular density and moderate elasticity,
which has the property of being 100 percent conductive to those
pulsations known as light, electricity and heat. Since it is completely
permeable to light vibrations, it is therefore _absolutely invisible and
non-reflective_. Its magnetic response is almost, but not quite, 100
percent also. It is therefore very heavy under normal conditions but
extremely responsive to the _repellor_ or anti-gravity rays, such as the
Hans use as "_legs_" for their airships.

Inertron is the second great triumph of American research and
experimentation with ultronic forces. It was developed just a few years
before my awakening in the abandoned mine. It is a synthetic element,
built up, through a complicated heterodyning of ultronic pulsations,
from "infra-balanced" sub-ionic forms. It is completely inert to both
electric and magnetic forces in all the orders above the _ultronic_;
that is to say, the _sub-electronic_, the _electronic_, the _atomic_ and
the _molecular_. In consequence it has a number of amazing and
valuable properties. One of these is _the total lack of weight_. Another
is a total lack of heat. It has no molecular vibration whatever. It
reflects 100 percent of the heat and light impinging upon it. It does
not feel cold to the touch, of course, since it will not absorb the heat
of the hand. It is a solid, very dense in molecular structure despite
its lack of weight, of great strength and considerable elasticity. It is
a perfect shield against the disintegrator rays.

[Illustration: Setting his rocket gun for a long-distance shot.]

Rocket guns are very simple contrivances so far as the mechanism of
launching the bullet is con