Weather map map using his own system of symbols, thereby creating the world's first weather map. He used his map to prove that air circulated clockwise around areas of high pressure; he coined the term 'anticyclone' to describe the phenomenon. He was also instrumental in publishing the first weather map in a newspaper, for which he modified the pantograph (an instrument for copying drawings) to inscribe the map onto printing blocks. "The Times" began printing weather maps using these methods with data from the Meteorological Office. The introduction of country-wide weather maps required the existence of national telegraph networks so that data
Third letter of Hernán Cortés to the Emperor Charles V In the first part of the letter, Cortés describes the Battle of Otumba, as well as the reorganisation of the Spanish troops after the defeat of the "Night of Sorrows" at Tlaxcala, with the aim of encircling Tenochtitlán. In reference to this reorganisation, Hernán Cortés relates that it was necessary to create "Military Ordinances" to establish order among the troops and avoid thefts and pillages. Cortés goes on to describe the construction of the brigantines used to enter Tenochtitlán by the canals. These vessels were manufactured in Tlaxcala, as this region was the main source of support for the Spaniards