Файл:Image from page 72 of "Practical methods of organic chemistry" (1901) (14768461381).jpg

Identifier: practicalmethods00gatt

Title: Practical methods of organic chemistry Year: 1901 (1900s) Authors: Gattemann, Ludwig. [from old catalog] Subjects: Publisher: [n.p.] Contributing Library: The Library of Congress Digitizing Sponsor: The Library of Congress

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Fig. 36. Fig. 37. Fig. 38. Similar to the Biichner funnel in its construction and action isthe so-called Nutsch filter. This consists of a shallow dish witha perforated bottom, which isfitted to the cover of a tubu-lated cylinder by means of arubber ring, the joint beingair-tight. This apparatus isespecially adapted to the filtra-tion of larger quantities thancan be conveniently treated inthe Biichner funnel (Fig. 39). If the solution to be filteredacts on the filter-paper, filter-cloth may be used in its place.A fine or coarse meshed clothis selected, according to thenature of the precipitate; it ismoistened before the nitration If this is also attacked, nitrocellulose cloth may be used ; it ismade by treating a cloth woven from plant fibres with a mixture of

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