![]() In layperson’s terms, this is best described through the relationship between A4 and A3 papers. He proposed that the ratio between the length of a page and its width should be founded in the square root of two. Rewind to 1786, when the idea of standardising the size of a letter was mooted, in a letter to the German scientist, Johann Beckmann, from his fellow countryman and physicist, Georg Christoph Lichtenberg. ![]() After developing and patenting an envelope-making machine, the classic diamond design we use today began.īefore we look at the different types of envelopes, their sizes, and uses, it’s worth knowing a little about how the paper they carry was developed. The credit goes to British inventors Warren de la Rue, and Edwin Hill. However, in the 19th Century, these paper packages started to evolve towards their more modern incarnation. Most of us are familiar with the idea of the sheets of paper, sealed with wax, that were used as envelopes during Medieval times. However, around 200 BC, they replaced the clay with paper wraps, and something close to the envelope we use today was born. Like their Babylonian counterparts, these would be broken, and the letter retrieved. As China spearheaded the development of paper, their letters were far less weighty and, instead, housed in clay spheres. While we can only pity the postmen who had to lug these around and deliver the letters to the recipient, who would then smash the clay to read what was inside.Īround the same time, the Chinese were developing similar types of envelopes for their messages. ![]() Back then, what we might consider ‘letters’ were chiselled into stone tablets and then baked in a layer of clay. However, the first types of envelope were markedly different from those that are familiar to us today. The standard defines the "A", "B" and "C" series of paper sizes, including A4, the most commonly available paper size worldwide.Believe it or not, the humble envelope has existed for over 4,000 years, beginning with Ancient Babylon. ISO 216 is an international standard for paper sizes, used across the world except in North America and parts of Latin America. The aspect ratio of catalog envelopes is between 1:1.3 and 1:1.5.Īll envelope sizes are shown in the table below. The most famous ones are Lady Gray (A2) and Diplomat (A9).Ĭatalog envelopes are designed for catalogs, brochures and other heavier content. They are mainly used for personal use, including photos, greeting cards, etc. Usually, the ratio of the short side to the long side (aspect ratio) is between 1:1.6 and 1:2.2.Īnnouncement envelopes are also called A-style or A-series envelopes. Commercial envelopes are long and thin and suitable for use in offices and commercial occasions. They are mainly divided into three categories: Commercial envelopes, Announcement envelopes and Catalog envelopes. The envelope sizes of US & North American are more diverse than those under the ISO 216 standard. Among the international standard sizes, the B series and C series are used more, and the DL format envelopes are the most used in commercial use. The standard envelope size is defined by the international standard ISO 269, but this standard has now been revoked and replaced with the ISO 216 standard, the paper size standard. ![]()
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