24
]
s ta n d /.■, Avliich in its tu r n is la s lie d to th e l)loAV-pipe
tahle.
AA'hen th e a p p a r a tu s is to lie u s e d , a su f f ic ie n t
q u a n t ity o f h o ile d d is t il l e d w a t e r is in t r o d u c e d in t o
th e h u lh , an d th e co rk d p u s h e d o v e r th e o p e n in g c.
T h e s e a -w a te r to h e e x am in e d is run d ir e c t ly in t o
th e fla sk fr om t lie d e e p -s e a w a t e r -h o t t le h y m e a n s o f
a t iih e Avith a narroAV o p e n in g r e a c h in g to th e h o t tom
o f th e fla sk , th e tu h e h e in g g r a d u a lly Avitlidrawn
u n t i l th e fla sk is over floAving. T h e o p e n in g c in th e
tu h e is th e n h r o n g h t j u s t hcloAV th e loAver su r fa c e o f
th e co rk , Avhicli is p r e s s e d t i g h t l y in t o th e n e c k o f
th e fla sk . A c e r ta in am o u n t o f Avater d isp la c e d h y
th e c o rk r is e s in to th e h u lh , a n d th e tu h e is c a r e fu lly
draAA-n npAvards t i l l th e o p e n in g is Avell Avithin th e
c o rk a n d th e r e fo r e c lo s ed . A sm a ll v a c u u m is th u s
p r o d u c e d , c a u s in g th e im m e d ia t e a p p e a r a n c e o f a ir -
h e l ls in th e Avater. T h e r e c e iv e r b is noAV a t ta c h e d ,
a n d th e Avater b r o u g h t t o b o il in g h y a h a n d sp ir it -
lam p , a n d k e p t so u n t il th e Avliole o f th e a ir h a s h e en
e x p e ll e d , Avhicli ta k e s fr om s ix t o e ig h t m in u t e s . .
AVhile th e Avater is s t i l l h o i l in g th e in d ia - r u h h e r tu h e
o n th e e x i t tu h e o f th e r e c e iv e r is c lo s e d Avitli a g la s s
s to p p e r so ta p e r e d th a t a t th e p o in t i t s lip s e a s ily
in t o th e tu b e , a n d h e in g p r e s s e d in c lo s e s i t t i g h t l y .
T h e r e c e iv e r is noAv h e rm e t ic a l ly s e a le d a t th e u p p e r
c o n t r a c t io n , a n d c o n n e c t io n m a d e h e tw e e n th e h u ll)
a n d th e fla sk h y p u s h in g doAvn th e tu h e u n t i l th e
h o le c is heloAv th e co rk. A liv e ly d is e n g a g em e n t of
g a s c om m e n c e s AA’b ic h is k e p t u p h y h e a t in g th e w a te r
in th e Avater-hath, th e Avater h e in g b r o u g h t sloAA’ly to
th e h o ilin g p o in t , a t Avliicli t em p e r a tu r e i t is r e ta in e d
fo r s om e t im e . AA’ h e n it is ju d g e d th a t th e g a s h a s
heen Avholly expelled the receiver is sealed up at the
lower contraction and the operation ended.
The arrangement employed for boiling the carbonic
acid out of sea-Avater is represented in Tig. 4.
The flask a has a capacity of about 500 cc., and
receives the sea-Avater to he operated upon usually
Fifi. 4.—The Ciirljonic-acid A]'parntus,
to the amount of 200 to 250 cc. It is closed hy an
india-rubber cork, through Avhich pass tAvo tubes ;
one reaching to the hottom communicates with the
atmosphere hy means of the soda-lime tuhe / , to
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