Richmond times-dispatch. [volume] (Richmond, Va.) 1914-current, 1920-10-17

IS bY J. A. EUDANK.
To meet the demand OF the general
public for simple presentation Of
IN" world-stirring theory of rela-
tifity. Professor Einstein himself has
prepared and offered to laymcn RE
IMtivity, the Special and the General
iheory. by Professor Albert Elm
stem. Ph. d.. LII. ID. Gienry Holt IL
70, New York;. In his preface TO the
present book is intended. as far as
pohSlDi., TO give an exact insight into
IN. theory OF. rclativity to those
readcrs who. from IL general scicnti-
nc and philosophical point of view.
are Interested In the theory. but who
are not convcrsant with the inathe-
inatical apparatus Of theoretical ply
sizes The work presumes standard
OF university matriculation exam
nation. and. despite the shortncss OF
me hook. fair amount of patience
and force OF VIII on the part of tho
reader. The author has spared him
self no pains in his endeavor to pre-
sent the main IDEAS In tho simplest
ana most Ineligible form. and on
me whole. In the sequence and con-
nection in which they actually orig
mated. In the interest or clcarncss
~ appeared to me Inevitable that
should repeat myself frequently
without paying the slightest attcn-
ton to the elegance OF the prcsen-
tation. adhered scruDulousiy to
the Drecept of that brilliant ;heo-
retical physicist. l.. Boitzmann. ac-
cording TO whom matters OF elegance
ought to be left to the tailor and to
the cobblcr make no pretcnse OF
having withheld from the reader dill
entities which are Inherent TO the
subject. On the other hand | have
nurros"ly treated the empirical ply
slcal foundations Of the thcory in n
slepmothcriy' fashion, SO that read
crs unfamiliar with physics may not
reel Ike the wandorer who was un-
abic to see the forest for trees MAY
the book bring some one few hours
o' ,snEscstive thought"
Up 20 the present, Ncwton's law OF
raVitatlon has been universally ac-
Sceptch, but there are instances where
thc Ncwtonian law only reaches high
approximation. whereas the new
.n ~ predicts the exact course OF
lion.
The iaynan. Of course. Will want
10 Know just what the theory OF.
,e'.uHlty ~. lie must read the book
70 thoroughly grasp the meaning Of
such deep and underlying theory:
Dut We would briefly say that Elm
s'eIh Theory Of RELATIVELY presents
1,n no" ms Tor inc translation OF events
from one coordinate trefcrence) sys-
.eIn 10 an equivalent coordinate svs-
I'm IN motion relative to the nrst
loT purposes Of precision in scientific
81
o. the laws or motion. brofessor
'hHstc!n mas used fast train and
an cnDankmcnt as proper set or
20 ord!nhie systems. Passengers on
tns .rain NIX" all events by space
ana time with reference to tho train
winch may b. regarded as at rest
mhHe the cmbankment moves. To
ouscF'.rs from the embankmcnt. the
t'"'' Us. OF course. In notion and
80 all cvents-spacc, time. innrns-
s,,oh"-are Fixed" with reference to
nI,v s",oa nknent. Space and time
treatise on the RELATIVELY Of tim.
ana me rc!ativ!ty Of distance Ispn,.nl
Exposes the apparent incombatabijIty
~ she iaw OF propagation OF ligh,
h.in me principle OF relatively as
o'lns untounded by fact. 4 formula
derived which Will satisfy cauivai-
en- CO. coordinate systems
ihe Treatment OF the principle OF
nrIinaisS applied to restricted CO.
called the special theory. Later
on me principle OF rclativity IL con.
S s. as To- coordinate systems in
The book. But the Lorentz i1aro
formation and M!nkowskrs four dim
chsionaI world are taken un. ard
mere 1,, are three valuable appendices.
Tho theory of RELATIVELY has proven
IT'S worth TO researchers in thn ' cIec'
IRON hcld. and TO astronomy. How.
yer Albert E!nste!n Is .nathe-
' AL ana Is wont TO md the
nuch-sousht fourth dimension St,cb
cnicavor certainly exercises the iorir
Oh one reasoning powers, but we are
inclined TO frown upon the par,IcuIa =
made public.
Geometry Is not altogether a mat
Oh mathematics. AT least the
man cannot be deceived as to the
creation with which he comes IL,
amy contact. Despite the fact thai
I'M. ~ FACTOR equivalent TO CO.
Htaihatcs or three dimensions In nix
d!,hcnsion. but merely measures the
othcT three. 1t Is not a co-ordina;n
nut a co-ordinativc factor. -
Al! inns question as To whether or
w." "' , ,h ~ fourth dimension grew,
We mink, out OF the Euciidcan cr
plantation OF the generation OF on
!ects: line Is generated by the mo-
non OF point. surface Is gem
cratsd by the motion of 4 line
Solo ~ generated by the motion OF n
surface. etc. The solid has rivcn
US threc dimensions. The next viii
o. in, Inc fourth. Is II forthcoming?
assumed. as the only convenient he
Bihhins; since IL is not n measure
nSht. however. lines, surfaces ana
S Joiins are measures The Euclidean
nature ,hd OF measures. 1t Is measure"
that gives significance TO relniivi,v
Applying the word measure" IN.
stead OF the several words ",,na.
surface, and solid" 10 Euc,idoo'r
definition, the Relationship Eins;nir:a
time bears to his space co-orIin
a'es can be investigated
MEASURE limits RELATIVELY.
Mot!oh limits measure:
flme" limits motion.
II is necessary to state tb,. -.
removal of any one OF tbesa :, inc
factors would geometricalIv csuv unree
version TO point of zero vaimo
hring out the fact that .!,;e 10 6,
though an equivalent fac,or ' ,,1',,
space dimensions. is not the f WIN
",,,nr ss put merely limits The
JAILED FOR FREEDOM r., Mt
York. 'erlSht. New
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