242 D. J. Macgowan on Chinese Horology. 
quadrant and armillary sphere, and the observations they made 
with them, even at that remote period, are remarkable for their 
accnracy, enabling them to form a useful calendar ;—the present 
eycle of sixty was adopted at that time by Hwangti, 2697-2597 
To this emperor is attributed the invention of the clepsy- 
dra. The instrument at that period was probably very rude, aud 
not used as a time-piece, but for astronomical purposes, in. the 
same manner as employed by Tycho Brahe for measuring the 
motion of stars, and subsequently by Dudely in making maritime 
observations. It was committed to the care of an officer of rank, 
styled Clepsydra Adjustor. 7 
he 
the speed of their rise or fall, according to the ever varying quan 
tity of. water in the vessel i 
indices differently divided. 'To keep the water from freezing 1? 
winter, the instrument was connected with a furnace and sur 
rounded by heated water... Chau flourished eleven centuries 
* CuronoLocy,—Although doubts otek ing ac a 
Chinese chronology, it must nevertheless be admitted, that it is so far correct as 
c 
se Celsus or Porphyry should arise and bring 
faith not easily answered, to the satisfaction of their countrymen. 
