A printed perpetual calendar on a cardboard tube which has a cork stopper, and inside is a spirit level tube. The tube into which the perpetual calendar and spirit level fit is labelled: 'Col Herschel's Almanack and also a spirit level tube'. Col. John Herschel was a Royal Engineer stationed in India from 1856.
- Image reference: F3308
- National Maritime Museum, Greenwich, London, Herschel Collection
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