Reduction of twenty years' photographic records of the barometer and dry-bulb and wet-bulb thermometers, and twenty-seven years' observations of the earth thermometers, made at the Royal Observatory, Greenwich This book, "Reduction of twenty years' photographic records of the barometer and dry-bulb and wet-bulb thermometers, and twenty-seven years' observations of the earth thermometers, made at the Royal Observatory, Greenwich", by Royal Greenwich Observatory, is a replication of a book originally published before 1878. It has been restored by human beings, page by page, so that you may enjoy it in a form as close to the original as possible. This book was created using print-on-demand technology. Thank you for supporting classic literature.