The Jamaica Telescope (Plate K)

"The instrument with which the photographs and many of the observations were made. The observer, seated in the small upper building, looked down through the whole tube toward the lower building, where the Moon appeared to him."

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A plate from Pickering's Atlas showing a quadrant of a full moon photo with faintly visible superimposed latitude and longitude grid; major craters also are circled. The original image in the Atlas is not of high quality, but this was apparently the first time grids were marked on lunar photos.