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Letter from the Cambridge Scientific Instrument Company to the Director General of Stores regarding a Solar Calorimeter which Dr. Buchanan of Christ's College, Cambridge for some experiments

This Letter is from the Director General of Stores to Roberts S. Whipple for reassembling for a final optical and photographic test before being packed for transit. The slits required for these instruments have the form of circular arcs, and to make a set of sufficiently high quality, which is necessary to devise and make a particular machine, a photograph of which would be enclosed.