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" The upper and wider part of the reflux tube has an internal diameter of 4'5 mm., the narrow, U-shaped part, which serves as a trap, an internal diameter of 3 mm. ; if, however, the number of constrictions exceeds 10 or 12, the traps for the lower reflux... "
Journal of the Chemical Society - Page 697
by Chemical Society (Great Britain) - 1899
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Fractional Distillation

Sydney Young - 1903 - 300 pages
...heated to redness, and these support small, glass reflux tubes, T, of the form shown in Fig. 43 b. The upper and wider part of the reflux tube has an...lower reflux tubes should be slightly wider, say, 3-5 mm. The length of the reflux tubes should be about 45 mm., and the distance between two constrictions...
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