Tachometric titration: A method for the detection of phase changes which are accompanied by changes in viscosity
✍ Scribed by Edwards, L. J.
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1950
- Weight
- 313 KB
- Volume
- 69
- Category
- Article
- ISSN
- 0368-4075
No coin nor oath required. For personal study only.
✦ Synopsis
Calibration may be effected by direct count at the lower speeds ; at the higher speeds the galvanometer reading may be correlated with o with the aid of a revolution-counter. With a I /3o-h.p. motor driven from a so-cycle, 230-v. supply, using a sliding resistance in series, a convenient working range for o was from o to 30 r.p.s. The resistance box in the galvanometer circuit enabled the circuit to be used for all speeds by a suitable choice of resistance. The total resistance of the galvanometer circuit, excluding the resistance box, was 650 9.; if at any given speed, o, with a resistance, R,, in the box, the galvanometer reading was found to be approaching the end of the scale, it was only necessary to insert a larger resistance, R,, in the box so that the reading dropped to A, where A, (650 + R,) = A, (650 -t R?)
The stirrer may be of any desired type. In the apparatus illustrated in Fig. I a paddle-bladed steel stirrer was used and