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Hydraulic Presses for Making Impressions of Fish Scales
Author(s) -
Greenbank John,
OˈDonnell D. John
Publication year - 1950
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1948)78[32:hpfmio]2.0.co;2
Subject(s) - fish <actinopterygii> , scale (ratio) , simple (philosophy) , environmental science , computer science , fishery , biology , physics , philosophy , epistemology , quantum mechanics
Two types of hydraulic press have been designed and constructed for making impressions of fish scales on cellulose acetate. One of these presses is hand‐operated; the other is powered by an electric motor. Each has a heated die to soften the plastic material. In growth studies the use of acetate impressions in place of the scales themselves results in a marked saving of time, materials, and storage space. Operation of the scale press is relatively simple, and the technical difficulties are relatively few and are corrected easily. Certain modifications and improvements are suggested.