L8.C. 6 Proes. of the Asiatic Soc. of Bengal. [N.S., XViTT 
to a result obtained in 
quence of the r n. According 
that the latter clock goes at a rate per- 
t 
he rotatio 
Section XII, it follows 
manently slower than 
circular disc, that is as observed from K. i 
the same effect would be noted by an observer whom we will 
imagine sitting alongside his clock at the centre of the circular 
dise.’’ 
But it is not at all obligatory to descend to actual base 
experiment in order to show a very extraordinary and contra- 
dictory result in the above proposition regarding clocks. I 
must remind you that Einstein postulates that not only will 
the clock in movement lose time continuously from the point 
of view of the stationary observer, but also his clock will lose 
time continuosly as viewed from the moving car (to revert to 
the Brookland’s experiment). That is the most amazing part 
of the business— each observer sees the other’s clock slow (for 
it is a matter of course to Einstein that this must happen by 
the simple Principle of Relativity). Now. let us assume some 
unheard of speed for the car and some sufficiently long conti- 
nued period (which we are entitled to do since the experiment 
Is purely imaginary), then a moment wil] surely come when 
the observer in the rushing car and the observer on the ground 
each sees the other’s clock registering, let us say, five minutes 
slow compared to his own. This seems all logical and correct 
according to the premises, for it is hardly necessary to remark 
that a clock that appears to lose a definite amount each 
second with regard to another is constantly getting more 
in terms, you will notice), and we have arrived as I anticipated 
at the quaintest possible reductio ad absurdum! : 
Those of you who do not know your Einstein may think 
, but nothing is further from my thought 
a nightmare)—and all is well again! I am not alone in my 
: : : 1 
discusses the same case, but somewhat differently in Nature. 
He writes :— 

' Relativity Number, 17th Feb , 1921, footnote, page 797. 

