William Temple Franklin British peace commissioners if something could be done for his father. He noted his father's steadfast defense of the Stamp Act, and hoped that the British government might award him a diplomatic post. During 1784, Temple went to London and reconciled with his father, lengthening his stay several times before returning to Paris at the end of the year. In January 1785, Temple received the first airmail in history when a letter from his father was brought across the English Channel by a hot air balloon flown by Jean-Pierre Blanchard and John Jeffries. When Benjamin Franklin relinquished his post and
Hot air balloon Montgolfier brothers, and had its first public demonstration on 4 June 1783 with an unmanned flight lasting 10 minutes, followed later that year with manned flights. The 1785 Rozière balloon, a type of hybrid balloon, named after its creator, Jean-François Pilâtre de Rozier, has a separate cell for a lighter than air gas (typically helium,) as well as a cone below for hot air (as is used in a hot air balloon) to heat the helium at night. Hydrogen gas was used in the very early stages of development but was quickly abandoned due to the obvious danger of introducing