T. C. Mendenhall— Acceleration of Gravity at Tokio, Japan. 129 
until Bessel again investigated the question a good many years 
later, was general attention called to the fact. About the year 
1830, Baily made an extensive series of experiments with a 
variety of pendulums, for the purpose of determining the true 
value of this correction. Unfortunately I am unable to refer 
to his results directly, but I believe that his conclusion was 
that for such a pendulum as was used in these determinations 
the ordinary correction should be multiplied by 1, and this 
factor has been used in correcting the results given. 
Below will be found the results of eleven different deter- 
minations, the first five of which were made on May 26, an 
the others on May 27. On both days during the time of vibra- 
tion, all of the conditions were sensibly constant and the same, 
and in addition to this the nights were favorable for the deter- 
mination of the chronometer rate. Each of the results is based 
pendent measurements of the chronograph record made by dif- 
ferent persons. 
~The value of “g” is calculated for each time of vibration 
determined, and each is corrected for buoyancy. These include 
all of the determinations made upon those two days, none hav- 
ing been rejected. 
Determination of the value of “g’” at Tokio, Japan. 
Latitude N, 35° 41’, long. E. 139° 44”. Ht. above sea level, 5 meters. 
Total length of pendulum, . ‘ 1014°18 mm. 
istance from knife edge to wire, 46°50 “ 
Length of wire, . ; : ; 93162. * 
Radius of ball, . : a : ; 18°03 “ 
Weight of ball, . . cea 198°951 grm. 
“wire, ‘ : . rOlS ° 
Density of ball, DT Me ES eee 
Length of equivalent simple pendulum, 994°59 mm. 
Time of vibration. Corresponding value of “g.” 
1°00103 ‘i F ‘ Z ‘ 9°7982 meters. 
100100 , ‘ ; . é . 9°7988 in 
1°00103 : : : ‘ ‘ 9°7982 " 
1°00104 , é ; & : . 9°7980 a 
1:00103 ‘ ; : = 9°7982 ite 
1°00101 . ‘ o ‘ . 9°7986 o 
1700102 y ‘ ‘ Fe 9°7984 = 
1700101 . “| ; - é . 9°7986 x4 
1°00103 fs > : $ ; 9°7982 ¥ 
100101 , n ‘ ri é - 9.7986 : 
.1:00100 - 9°7988 
Mean of all results, g=9°7984. 
Am. Jour. Sct.--Tup Szrres, Vou. XX, No. 116.—Ave., 1880. 
9 
