CONTENTS 



Page 



Introduction 1 



Description of modifications: 



Desiccant holders 1 



External "C" battery unit and associated circuitry 3 



The battery charger unit 3 



Modification of cell holder 4 



Discussion and conclusions 5 



FIGURES 



1,- -Modified Beckman DU Spectrophotometer iv 



2. --View of modified cell compartment and phototube housing iv 



3. --Diagrammatic representation of Spectrophotometer modification 3 



4, --Diagram of wiring in "C" battery unit and meter test unit 



(Terminal strip positions B and C are connected to the yellow and white 



leads in the Beckman DU Spectrophotometer, respectively.) 4 



5. --Wiring diagram (sennidiagrammatic) of battery charger unit 5 



111 



