Note 25 — Chapter I

However good the glass, it is very difficult to make use of it for faint or distant objects on the horizon, and on the whole I found it easier to discern the first dim line of land far off by the unaided eye. A slight mark, that would not be observed while only a short piece of it is seen in the field of view, becomes decidedly manifest if a large scope is seen at once. The binocular glass was very valuable, however, when the words on a buoy, or the colour on the chequers of a beacon had to be deciphered.