Snellen chart H, K, O, S, 3, U, Y, A, C, E, G, L, 2. The normal Snellen chart is printed with eleven lines of block letters. The first line consists of one very large letter, which may be one of several letters, for example E, H, or N. Subsequent rows have increasing numbers of letters that decrease in size. A person taking the test covers one eye from 6 metres or 20 feet away, and reads aloud the letters of each row, beginning at the top. The smallest row that can be read accurately indicates the visual acuity in that specific
Letter-Books of the City of London Letter-Books of the City of London The Letter-Books of the City of London are a series of fifty folio volumes in vellum containing entries of the matters of in which the City of London was interested or concerned, beginning in 1275 and concluding in 1509. The volumes are part of the collection of the City of London Records Office, and are kept in the London Metropolitan Archives. The volumes derive their name from being lettered from "A" to "Z" (with two odd volumes marked respectively "&c." and "AB") and again from "AA" to "ZZ". Besides being known by distinctive letters,