AN ALL-GLASS STILL. For the continuous production of distilled water of analytical quality
✍ Scribed by Smith, I. C. P.
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1938
- Weight
- 333 KB
- Volume
- 57
- Category
- Article
- ISSN
- 0368-4075
No coin nor oath required. For personal study only.
✦ Synopsis
by nieans of a suitable potentio~ueter.~ A. scratch was therefore made in tlic paint film of the rod and the potential of thc two rods, immersed in London rain water, was mensured against a saturated calomel clcctrode over a period of 30 hours. The results are shown in Pig. 1. From the upper graph it will be seen that t,he plain steel became more anodic as tlic rust film developed. This is characteristic." On the otlicr hand, the steel exposed by the scratch in the red lead film became icss anodic ns time went on. This, i t can be shown, is due to the action of tlic red lead dcveloping ii film on the mctnl producing the passive state.
Xoiv it is iinportant to nscerhin whether the presence of a graphite film 011 the inctallic surfiice would affect this dcvclopment of the passive state by the red lend, rind for tliis purpose two steel roils were prepared by polisliing in 11 lntlic and wliilc oiic was still Iicld in the chuck its cnd wiis contctl with " Aquiidag " nnd rotated agniiisL still' fiibric uiitil dry. JIucli of the