Photograph of lumimeter assembly. Anne Rose Steel, Isabel Steele, Sally Sewell, Jean McCrellis, Maude O’Brien and Margaret Rodgers

Photograph of lumimeter assembly. Anne Rose Steel, Isabel Steele, Sally Sewell, Jean McCrellis, Maude O’Brien and Margaret Rodgers

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Photograph of lumimeter assembly. Anne Rose Steel, Isabel Steele, Sally Sewell, Jean McCrellis, Maude O'Brien and Margaret Rodgers

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