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Home → Publications → Tree Planters' Notes → Tree Planters' Notes Issue 66 (1964) → A Slide Rule for Computing Seed Needs and Sowing Rates in Forest Nurseries

A Slide Rule for Computing Seed Needs and Sowing Rates in Forest Nurseries

Every forest nursery, to produce a certain quantity of seedlings, must determine the amount of seed of each lot needed or/and the pounds of seed to sow per bed. Usually this is done in longhand or on a desk calculator, methods which are accurate but time consuming. A multiple slide rule (fig. 1) described here can be used to calculate the pounds of seed needed or sowing rates rapidly, accurately, and simply. For clarity, this rule will be referred to as the Wilson slide rule. It is used much the same as a conventional engineer's slide rule; numbers can be multiplied or divided by adding or subtracting their logarithms. It consists of six scales, four of them sliding.


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Author(s): Boyd C. Wilson

Publication: Tree Planters' Notes - Issue 66 (1964)