Limnological Methods |
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accuracy alidade angle apparatus attached base line boat bottom materials brass bucket cable centrifuge color computed concentrate Considerations construction convenient cord counting cell cubic depth described desired determined diameter disk dredge edge equipment error field filter frame funnel glass tube graduated horizontal indicated instrument intervals lake length limnological limnologist located lower end magnetic bearing mark measure mesh metal meter method micrometer microscope necessary Negretti and Zambra ocular ocular micrometer operator oxygen paper periphyton phenolphthalein pipet Pitot tube plane table planimeter plankters plankton Procedure protractor reading record ring rope sampler sand scale distance screen secured selected sextant shore line shore-line side sieve signal sodium thiosulfate sounding line square stadia rod standard stratum stream submerged suitable surface survey tape temperature thermometer tion transit station transverse measurements turbidimeter unit upper velocity vertical volume weight wire