The Chain Block Design

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Abstract
For physical or chemical expts. in which measurements are made with a high degree of accuracy, many standard designs require more replicates than are needed. The chain block design requires that some but not all treatments be replicated, only a number sufficient to provide reasonably accurate estimates of exptl. error and interblock error. The avg. number of replicates is between 1 and 2, usually closer to 1 for expts. with many treatments. The design is illus. with spectrographic detns. of nickel in a series of rods prepared from the same ingot.

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