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By E. Kay, R Brown, G. Chandler and W. A. Davis (Auth.)

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For any given height the area under Method 2 will therefore be less than the area under Method 1. It is clear that, since a collecting round consists effectively of a round trip over the area with or without back-tracking, the smaller the area the shorter the collecting round. On the whole, therefore, for sequential picking, Method 2 must be preferable to Method 1 ; this is true for whatever height can be usefully and economically employed in storing. As from the discussion in Chapters 4, 5 and the example, it appears that, when many varieties are stored, Method 2 is often preferable at least for a significant part of the total storage requirement, we feel that discussion of sequential picking under Method 1 is unnecessary.

In practice, Wi = ^{Kidgd) is hardly ever a whole number, hence one must choose the nearest whole numbers. 4. Nevertheless, even the approximation to the ideal minimum that is necessary in practice, will not disturb greatly the shape of the block of cells that ensures minimal handling effort, and that shape can in practice be achieved, certainly in new buildings, that are designed on the basis of the above formulae, and possibly in old buildings. If, in any existing buildings, it should not be possible to arrange the cells into the required minimal block, the formulae will permit calculation of the excess handling effort over the theoretical minimum, that is due to the effect of the building, and thence can be used in evaluating the advantages of a move to a different building.

Conversely, given K* and K, the average stock level over time, K9 is given by i ( ^ * + K), and this must, of course equal to the average stock as derived from o»ther sources. If we write μ = Κ/Κ, then K* = (2-μ)Κ. 5. The total average movement, in and out, in the average replenishment period is, therefore, given by M = 4( 1 — μ)Κ, and the average volume occupied by this movement is (2 — 2μ)Κ. The value of μ can easily be obtained from stock records, by evaluating the ratio K/K or from the expression Μ= 4(\-μ)Κ.

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