Engineering drawing drawing on A3 may be enlarged to A2 or reduced to A4. The U.S. customary "A-size" corresponds to "letter" size, and "B-size" corresponds to "ledger" or "tabloid" size. There were also once British paper sizes, which went by names rather than alphanumeric designations. American Society of Mechanical Engineers (ASME) ANSI/ASME Y14.1, Y14.2, Y14.3, and Y14.5 are commonly referenced standards in the U.S. Technical lettering is the process of forming letters, numerals, and other characters in technical drawing. It is used to describe, or provide detailed specifications for an object. With the goals of legibility and uniformity, styles are standardized and
Ledger stone that are still operating at Golzinne and Mazy. It is noticeable that an almost jet black marble, similar to Nero Belgio occurs as ledger slabs in that later part of the 18th and early 19th century, an example being Dean Kaye's memorial in Lincoln Cathedral. Many other black ledger stones of the 17th to 19th. centuries have white flecking, which may also suggest that they come from Belgian sources. Neale notes references in the Hull Port in the 17th and 18th to the importation of ledger stones and draws comparisons between those in churches in Humberside and those in St