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Vol. 4, No. 1
ANALYTICAL EDITION
extractors have proved of great value in large-scale extractions, enabling the entire operation t o be performed within all-glass equipment, thus replacing metal apparatus and eliminating cork stoppers and rubber or ground-glass connections. LITERATURE CITED (1) Cary-Curry, H.J , J. IND. ENQ.C H ~ M4, . , 535 (1912). (2) Ford, T. B., J. Am. Chem. SOC.,34, 552 (1912). (3) Lamar-Cohn, “Organic Laboratory Methods,” translated by Oesper, 1st ed., p. 195, Williams & Wilkins, 1928. ’ (4) Pickel, J. M., J. IND. ENO.CHEM.,11, 1053 (1919). (6)Walker, P. H., and Bailey, L. H., Ibid., 6,497 (1914). RECEIVED October 6, 1931.
Mechanical Shaking Device 0. W. CHAPMAN AND FREDCINOTTO, Kansas State ‘
Teacher’s College, Pittsburg, Kans.
T
FIGURE 1. DIAGRAM OF APPARATUS
attention whatsoever and without any addition of solvent after the initial charge has been introduced. The modified apparatus is no more difficult to operate than the conventional Soxhlet with attached condenser, A short loop of stiff wire is made across the water inlet and outlet tubes, and is used to suspend the condenser from a hook of brass rod, placed a t such a height that the condenser freely ‘clears the top of the extraction tube during the introduction or removal of sample or solvent. If the thimble containing the sample is plugged with extracted absorbent cotton, it may be removed by simply inverting the apparatus, for otherwise it is necessary to employ a pair of long dissecting forceps.
FIGURE2. BATTERY OF MODIFIED EXTRACTORS
The dimensions given in Figure 1 correspond with those of the standard Soxhlet designed to take a 33 by 80 mm. thimble, but extractors of identical construction and of very large capacity have been made in this laboratory by the use of the largest Pyrex tubing available (60 mm. in diameter). These
HE accompanying diagram shows the construction of an inexpensive shaking device which may easily be made in the laboratory. It was designed for use in the study of the corrosive action of milk on metals, and so made that the liquid flowed constantly over the immersed strips of metal. The device consists of a metal water bath, 12 inches (30.5 cm.) in diameter by 20 inches (51 cm.) high. The remaining parts are of wood, painted to prevent warping. The drive shaft is connected to a metal eccentric, which is attached to the chuck of a friction drive stirrer. This permits convenient regulation of the rate of shaking, while the length of the stroke is controlled by the point of attachment of the drive shaft. )To chuck of Cenco Friction Drive Stirrer
FIGURE1. MECHANICAL SHAKING
DEVICE
The apparatus desoribed furnished a satisfactory shaking device at a low cost. RIWEIVH~D July 28, 1931.
