Limnological Methods |
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Page 187
... screen is installed between the two as shown in the sketch . The screen is brass and of whatever mesh is desired . Common and convenient sizes are 10 , 20 and 30 meshes to the inch . Across the lower surface of the screen and in contact ...
... screen is installed between the two as shown in the sketch . The screen is brass and of whatever mesh is desired . Common and convenient sizes are 10 , 20 and 30 meshes to the inch . Across the lower surface of the screen and in contact ...
Page 191
... screen a slight vertical up - and - down motion . By this method all of the material passing through the third screen is lost . Should this material be desired it must be collected by the addition of another screen of still finer mesh ...
... screen a slight vertical up - and - down motion . By this method all of the material passing through the third screen is lost . Should this material be desired it must be collected by the addition of another screen of still finer mesh ...
Page 332
... screen of type described on p . 186 and slip under plants as they approach surface ; lift screen and contained plants and discharge all contents into large tub . 3. Repeat this form of collection until desired quantity of plants is ...
... screen of type described on p . 186 and slip under plants as they approach surface ; lift screen and contained plants and discharge all contents into large tub . 3. Repeat this form of collection until desired quantity of plants is ...
Contents
HYDROGRAPHIC MAPPING AND MORPHOMETRY | 1 |
Color | 220 |
Lines | 337 |
Copyright | |
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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