2982
JOURNAL OF CHEMICAL EDUCATION
3 Aquaria 1 Motor 3 Regulators 3 Relays 6 Resistances 3 Stirrers
DECEMBER, 1930
a t 524.00
$ 72.00
a t 10.00 a t 12.00 a t 6.00 a t 1.OO
35.00 30.00 36.00 36.00 3.00
Total for three baths
$212.00
As stated previously, this cost could be considerably reduced. Cheaper types of baths are easily obtainable; an a. c. motor could be used and geared down, homemade resistances could be employed, but when the instructor's time and the results are considered the above combiiations are, in our experience, the most satisfactory yet found.
Jubilee Exbibition of Bohemian Glass. The Bohemian glass industry was founded in the 17th century and rapidly attained t o some importance in the Iser and Sazava valleys. There is now in progress a t Zelezny Brod, one of the chief centers of the Czechoslovak glass industry, a n exhibition of glassware. The chemical glassware, a familiar product in all laboratories, comes chiefly from Sazava where wood is still partly used as fuel. An idea of the extent of the industry may be gathered from the production figures for blown glass: Value in
Yeor
Tons
I h o u ~ m d~ o i o n s
1922 1923 1924 1925 1926 1927 1928 1929
41,186 37,197 51,408 58,153 56,188 60,593 68,756 68,713
403,106 327,945 430,661 527,657 501,560 518,615 571,592 583.192
The figures for plate glass are also rising annually, while in addition there is a considerable output of fancy glassware a t Jahlonec (Gahlanz). The production of plate glass is given in the following table: Yeor
Tons
1922 1923 1924 1925 1926 1927 1928 1929
32,617 28,745 44,074 50,346 50,872 56,706 69,888 87.046
Valve in lhorrsand crowns
107.023 71,080 97,662 120.946 135.107 150,906 182,617 221,706 -Chem.
N6ws
