Cloud atlas was published in 1802. It followed a similar effort in French by Jean-Baptiste Lamarck in 1801. Howard's nomenclature defined four fundamental types of clouds: cirrus or thread-cloud, cumulus or heap-cloud, stratus or flat cloud (level sheet), and nimbus or rain-cloud (see Classification of clouds). There followed a long period of development of the field of meteorology and the classification of clouds, leading up to 1896, the International Year of Clouds. The history of this period is the subject of a popular book, "The Invention of Clouds". During that time, the Englishmen Rev. Clement Ley and Hon. Ralph Abercromby, were influential.
Term sheet documents meant to record two or more parties' intentions to enter into a future agreement based on specified (but incomplete or preliminary) terms. The difference between the two is slight and mostly a matter of style: an LOI is typically written in letter form and focuses on the parties' intentions; a term sheet skips most of the formalities and lists deal terms in bullet-point or similar format. There is an implication that an LOI only refers to the final form. A term sheet may be a proposal, not an agreed-to document. Within the context of venture capital financing, a term