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The microcalorimetl'ic m ethod for evaluation of the efficienc y and substitution error of a bolometer mount proposed by Macpherson and K erns has been the object of further study and refinement at t he Boulder La boratories of the National Bureau of Standards, and an improved instrument based on t his technique has been recent ly placed in operation.The new microcalorimeter d esign features are: (1) Greatly improved a mbient temperat ure control, permitt ing higher sensitivity and resolution; (2) improved d-c instrum entation ;(3) improved mechanical construction giving better r epeat ability; (4) relocation of the t hermopile so t hat it no longer is attached directly to the bolometer mount, thus providing fl ex ibility in t he choice of term ination; and (5) a more comprehensive treatment of t he calorimetric substitut ion or equiva lence error.These features p ermit the d etermination of t he effective efficiency of a bolometer mount to an accuracy of better t han 0.2 p ercent.
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Glenn F. Engen (1959) studied this question.
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