The white and black cords represent death. Any handmade envelope is effectively a lettersheet because prior to the folding stage it offers the opportunity for writing a message on that area of the sheet that after folding becomes the inside of the face of the envelope.Ī Japanese funeral envelope used for offering condolence money. Īn aerogram is related to a lettersheet, both being designed to have writing on the inside to minimize the weight. As of 2009 there is no international standard for window envelopes, but some countries, including Germany and the United Kingdom, have national standards. The treated area became sufficiently translucent for the address to be readable. One innovative process, invented in Europe about 1905, involved using hot oil to saturate the area of the envelope where the address would appear. In some cases, shortages of materials or the need to economize resulted in envelopes that had no film covering the window.
Callahan in 1901 and patented the following year. The window is normally covered with a transparent or translucent film to protect the letter inside, as was first designed by Americus F.
They are generally arranged so that the receiving address printed on the letter is visible, saving duplication of the address on the envelope itself. Window envelopes have a hole cut in the front side that allows the paper within to be seen. They are most commonly used for enclosing and sending mail ( letters) through a prepaid-postage postal system.
Although in principle the flaps can be held in place by securing the topmost flap at a single point (for example with a wax seal), generally they are pasted or gummed together at the overlaps. Patent drawing of Americus Callahan's windowed envelopeĪ folding sequence such that the last flap closed is on a short side is referred to in commercial envelope manufacture as a pocket – a format frequently employed in the packaging of small quantities of seeds.
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