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. Fresh-water biology. Freshwater biology. 74 FRESH-WATER BIOLOGY D. Quantitative Methods in Open Water I. The Quantitative Plankton Net. The plankton net and pump are intended for the collection of plankton for quantitative inves- tigations. The plankton net differs from the townet described in that its rim extends upward into a truncated cone of canvas (Fig. 17), and that it is provided with a removable bucket. The canvas cone hinders bottom ooze from entering the net and also hinders the slopping out of the contents as the net is drawn above the surface. It serves further to lessen the diam Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/fresh-water-biology-freshwater-biology-74-fresh-water-biology-d-quantitative-methods-in-open-water-i-the-quantitative-plankton-net-the-plankton-net-and-pump-are-intended-for-the-collection-of-plankton-for-quantitative-inves-tigations-the-plankton-net-differs-from-the-townet-described-in-that-its-rim-extends-upward-into-a-truncated-cone-of-canvas-fig-17-and-that-it-is-provided-with-a-removable-bucket-the-canvas-cone-hinders-bottom-ooze-from-entering-the-net-and-also-hinders-the-slopping-out-of-the-contents-as-the-net-is-drawn-above-the-surface-it-serves-further-to-lessen-the-diam-image231972979.htmlRMRDB7W7–. Fresh-water biology. Freshwater biology. 74 FRESH-WATER BIOLOGY D. Quantitative Methods in Open Water I. The Quantitative Plankton Net. The plankton net and pump are intended for the collection of plankton for quantitative inves- tigations. The plankton net differs from the townet described in that its rim extends upward into a truncated cone of canvas (Fig. 17), and that it is provided with a removable bucket. The canvas cone hinders bottom ooze from entering the net and also hinders the slopping out of the contents as the net is drawn above the surface. It serves further to lessen the diam
![. Fresh-water biology. Freshwater biology. METHODS OF COLLECTING AND PHOTOGRAPHING 79 The end of the hose may also be lowered to near the bottom and may then, while pumping is in progress, be slowly drawn upward at a uniform rate. In this way is pumped a vertical column of water which extends from the bottom to the surface, and the volume of such a column may be calculated. The following forms of plankton pump may be referred to briefly. (a) Fordyce pump (Foidyce, i8g8). This invention of Professors Ward and Fordyce is shown in perspective (Fig. 21) and in sec- tion (Fig. 22). It "is prac Stock Photo](https://c8.alamy.com/comp/PFW0W7/fresh-water-biology-freshwater-biology-methods-of-collecting-and-photographing-79-the-end-of-the-hose-may-also-be-lowered-to-near-the-bottom-and-may-then-while-pumping-is-in-progress-be-slowly-drawn-upward-at-a-uniform-rate-in-this-way-is-pumped-a-vertical-column-of-water-which-extends-from-the-bottom-to-the-surface-and-the-volume-of-such-a-column-may-be-calculated-the-following-forms-of-plankton-pump-may-be-referred-to-briefly-a-fordyce-pump-foidyce-i8g8-this-invention-of-professors-ward-and-fordyce-is-shown-in-perspective-fig-21-and-in-sec-tion-fig-22-it-quotis-prac-PFW0W7.jpg ". Fresh-water biology. Freshwater biology. METHODS OF COLLECTING AND PHOTOGRAPHING 79 The end of the hose may also be lowered to near the bottom and may then, while pumping is in progress, be slowly drawn upward at a uniform rate. In this way is pumped a vertical column of water which extends from the bottom to the surface, and the volume of such a column may be calculated. The following forms of plankton pump may be referred to briefly. (a) Fordyce pump (Foidyce, i8g8). This invention of Professors Ward and Fordyce is shown in perspective (Fig. 21) and in sec- tion (Fig. 22). It "is prac Stock Photo")
. Fresh-water biology. Freshwater biology. METHODS OF COLLECTING AND PHOTOGRAPHING 79 The end of the hose may also be lowered to near the bottom and may then, while pumping is in progress, be slowly drawn upward at a uniform rate. In this way is pumped a vertical column of water which extends from the bottom to the surface, and the volume of such a column may be calculated. The following forms of plankton pump may be referred to briefly. (a) Fordyce pump (Foidyce, i8g8). This invention of Professors Ward and Fordyce is shown in perspective (Fig. 21) and in sec- tion (Fig. 22). It "is prac Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/fresh-water-biology-freshwater-biology-methods-of-collecting-and-photographing-79-the-end-of-the-hose-may-also-be-lowered-to-near-the-bottom-and-may-then-while-pumping-is-in-progress-be-slowly-drawn-upward-at-a-uniform-rate-in-this-way-is-pumped-a-vertical-column-of-water-which-extends-from-the-bottom-to-the-surface-and-the-volume-of-such-a-column-may-be-calculated-the-following-forms-of-plankton-pump-may-be-referred-to-briefly-a-fordyce-pump-foidyce-i8g8-this-invention-of-professors-ward-and-fordyce-is-shown-in-perspective-fig-21-and-in-sec-tion-fig-22-it-quotis-prac-image216293763.htmlRMPFW0W7–. Fresh-water biology. Freshwater biology. METHODS OF COLLECTING AND PHOTOGRAPHING 79 The end of the hose may also be lowered to near the bottom and may then, while pumping is in progress, be slowly drawn upward at a uniform rate. In this way is pumped a vertical column of water which extends from the bottom to the surface, and the volume of such a column may be calculated. The following forms of plankton pump may be referred to briefly. (a) Fordyce pump (Foidyce, i8g8). This invention of Professors Ward and Fordyce is shown in perspective (Fig. 21) and in sec- tion (Fig. 22). It "is prac
![. Fresh-water biology. Freshwater biology. METHODS OF COLLECTING AND PHOTOGRAPHING 79 The end of the hose may also be lowered to near the bottom and may then, while pumping is in progress, be slowly drawn upward at a uniform rate. In this way is pumped a vertical column of water which extends from the bottom to the surface, and the volume of such a column may be calculated. The following forms of plankton pump may be referred to briefly. (a) Fordyce pump (Foidyce, i8g8). This invention of Professors Ward and Fordyce is shown in perspective (Fig. 21) and in sec- tion (Fig. 22). It "is prac Stock Photo](https://c8.alamy.com/comp/RDB7TT/fresh-water-biology-freshwater-biology-methods-of-collecting-and-photographing-79-the-end-of-the-hose-may-also-be-lowered-to-near-the-bottom-and-may-then-while-pumping-is-in-progress-be-slowly-drawn-upward-at-a-uniform-rate-in-this-way-is-pumped-a-vertical-column-of-water-which-extends-from-the-bottom-to-the-surface-and-the-volume-of-such-a-column-may-be-calculated-the-following-forms-of-plankton-pump-may-be-referred-to-briefly-a-fordyce-pump-foidyce-i8g8-this-invention-of-professors-ward-and-fordyce-is-shown-in-perspective-fig-21-and-in-sec-tion-fig-22-it-quotis-prac-RDB7TT.jpg ". Fresh-water biology. Freshwater biology. METHODS OF COLLECTING AND PHOTOGRAPHING 79 The end of the hose may also be lowered to near the bottom and may then, while pumping is in progress, be slowly drawn upward at a uniform rate. In this way is pumped a vertical column of water which extends from the bottom to the surface, and the volume of such a column may be calculated. The following forms of plankton pump may be referred to briefly. (a) Fordyce pump (Foidyce, i8g8). This invention of Professors Ward and Fordyce is shown in perspective (Fig. 21) and in sec- tion (Fig. 22). It "is prac Stock Photo")
. Fresh-water biology. Freshwater biology. METHODS OF COLLECTING AND PHOTOGRAPHING 79 The end of the hose may also be lowered to near the bottom and may then, while pumping is in progress, be slowly drawn upward at a uniform rate. In this way is pumped a vertical column of water which extends from the bottom to the surface, and the volume of such a column may be calculated. The following forms of plankton pump may be referred to briefly. (a) Fordyce pump (Foidyce, i8g8). This invention of Professors Ward and Fordyce is shown in perspective (Fig. 21) and in sec- tion (Fig. 22). It "is prac Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/fresh-water-biology-freshwater-biology-methods-of-collecting-and-photographing-79-the-end-of-the-hose-may-also-be-lowered-to-near-the-bottom-and-may-then-while-pumping-is-in-progress-be-slowly-drawn-upward-at-a-uniform-rate-in-this-way-is-pumped-a-vertical-column-of-water-which-extends-from-the-bottom-to-the-surface-and-the-volume-of-such-a-column-may-be-calculated-the-following-forms-of-plankton-pump-may-be-referred-to-briefly-a-fordyce-pump-foidyce-i8g8-this-invention-of-professors-ward-and-fordyce-is-shown-in-perspective-fig-21-and-in-sec-tion-fig-22-it-quotis-prac-image231972968.htmlRMRDB7TT–. Fresh-water biology. Freshwater biology. METHODS OF COLLECTING AND PHOTOGRAPHING 79 The end of the hose may also be lowered to near the bottom and may then, while pumping is in progress, be slowly drawn upward at a uniform rate. In this way is pumped a vertical column of water which extends from the bottom to the surface, and the volume of such a column may be calculated. The following forms of plankton pump may be referred to briefly. (a) Fordyce pump (Foidyce, i8g8). This invention of Professors Ward and Fordyce is shown in perspective (Fig. 21) and in sec- tion (Fig. 22). It "is prac
. Fresh-water biology. Freshwater biology. 74 FRESH-WATER BIOLOGY D. Quantitative Methods in Open Water I. The Quantitative Plankton Net. The plankton net and pump are intended for the collection of plankton for quantitative inves- tigations. The plankton net differs from the townet described in that its rim extends upward into a truncated cone of canvas (Fig. 17), and that it is provided with a removable bucket. The canvas cone hinders bottom ooze from entering the net and also hinders the slopping out of the contents as the net is drawn above the surface. It serves further to lessen the diam Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/fresh-water-biology-freshwater-biology-74-fresh-water-biology-d-quantitative-methods-in-open-water-i-the-quantitative-plankton-net-the-plankton-net-and-pump-are-intended-for-the-collection-of-plankton-for-quantitative-inves-tigations-the-plankton-net-differs-from-the-townet-described-in-that-its-rim-extends-upward-into-a-truncated-cone-of-canvas-fig-17-and-that-it-is-provided-with-a-removable-bucket-the-canvas-cone-hinders-bottom-ooze-from-entering-the-net-and-also-hinders-the-slopping-out-of-the-contents-as-the-net-is-drawn-above-the-surface-it-serves-further-to-lessen-the-diam-image216293774.htmlRMPFW0WJ–. Fresh-water biology. Freshwater biology. 74 FRESH-WATER BIOLOGY D. Quantitative Methods in Open Water I. The Quantitative Plankton Net. The plankton net and pump are intended for the collection of plankton for quantitative inves- tigations. The plankton net differs from the townet described in that its rim extends upward into a truncated cone of canvas (Fig. 17), and that it is provided with a removable bucket. The canvas cone hinders bottom ooze from entering the net and also hinders the slopping out of the contents as the net is drawn above the surface. It serves further to lessen the diam
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