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Vol. 15—1961 - NorthEastern Weed Science Society

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468.<br />

slide moved across the orifi~e at two millimeters, per hour<br />

by a clock mechanism: A continuous trace of the day t s sample<br />

is deposited on an area 14 x 48 rom. this sampler was designed<br />

primarily for fungus sp~res much smaller than ragweed pollen<br />

and for its intended purpose its accuracy is high. F~r .<br />

particles in the size range of ragweed pollen it is subject,<br />

to the errors of anisokinetic ~ampling, although the ,orifice<br />

is streamlined

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