Transactions of the American Electrochemical Society Volume 11
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 edition. Excerpt: ...apparatus, the form of which is shown in Fig. 2. This is essentially a modification of the well-known form of apparatus recommended by Ostwald for measuring relative viscosity, but made entirely of metal, preferably of platinum. In our apparatus, the reservoir was made of silver, to reduce expense; the remainder was of platinum. The capillary, C, was 0.6 mm. diameter and 10 cm. long, and enclosed in an outer tube of platinum, 3 mm. in diameter, to protect it from injury. The salt was first introduced as powder, and then melted in the reservoir, A (about 100 cc. capacity). It was then forced up, by means of compressed air, through the capillary C until the bulb B was completely filled, and then allowed to flow back into A under the influence of gravity. The novel feature of the apparatus was the method of noting the time it took the liqiud is the bulb B to flow back through the capillary. This was accomplished by noting the time the surface of the liquid broke contact first, with a very fine platinum electrode extending nearly down to the top of the bulb B, and second, with a similar independent electrode adjusted to the lower end of the bulb, where it joined the capillary. The time of breaking these circuits was noted by a telephone placed in series with an induction coil. When the two electrodes were properly centered, the time of flow could be determined with a precision of about one second in 800 seconds. The whole apparatus was immersed in the fused nitrate bath, thus enabling a very uniform temperature to be maintained throughout. This' form of apparatus has the advantage that if constructed wholly of platinum, it may be used for viscosity measurements up to the decomposition point of almost any liquid. The apparatus gives relative...
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