A REPORT ON THE THEORY OF RELATIVITY. 
(EINSTEIN THEORY) 
Paul Biefeld 
During the past twenty-five to thirty years phenomenal work 
has been done in the physical sciences. We need only recall 
X-rays, followed by radioactivity, then electrons and wireless. 
The experimental work along these lines has, however, also 
brought into question some of the fundamental principles of the 
science itself; leading to the abandonment, notably, of the follow- 
ing three : the unchangeableness of the atom, the independence 
of space and time,, and the continuity of dynamical action. The 
letting go of the first led to the electron theory, of the second to 
the theory of relativity, and of the third to the quantum theory. 
The corner stones of the structure have, however, been in no wise 
affected. The principle of the conservation of energy and that of 
the conservation of mass, although the latter has been merged 
into the first by the restricted theory of relativity; the laws of 
thermodynamics ; the principle of least action ; all of these have 
been all the more firmly established. They have stood the fire of 
searching experiment of modern physics. 
The Restricted Principle of Relativity 
It is necessary at the outset to consider the concepts of space 
and time, in particular the relation of these concepts to experi- 
ence. In this connection the terms “absolute space’’ and “abso- 
lute time” have no meaning. The physicist thinks of space only 
in connection with the occurrence of events. In fact it is not 
even the point in space ‘where’ something is, nor the instant of 
time ‘when’ something happens, but the event itself, that is to 
him the only physical reality. 
We shall consider the distance or space interval between two 
points referred to a body of reference or frame of reference ex- 
pressed in Cartesian cocrdinatee.. Calling x^,Xo,Xo the coordi- 
nates, the interval becomes : 
s-= Ax‘J+ Ax;-k Axj: (1) 
in which the Ax’s are the projections of the interval on the axes, 
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