scale of surveying
51Timothy P. Marshall — Infobox Scientist box width = name = Tim Marshall image width = caption = birth date = October 17, 1956 birth place = Evergreen Park, Illinois, USA death date = death place = residence = Dallas–Fort Worth Metroplex, Texas, USA fields =… …
52geography — /jee og reuh fee/, n., pl. geographies. 1. the science dealing with the areal differentiation of the earth s surface, as shown in the character, arrangement, and interrelations over the world of such elements as climate, elevation, soil,… …
53Japanese maps — The earliest known term used for maps in Japan is believed to be kata (形, roughly form ), which was probably in use until roughly the 8th century. During the Nara period, the term u (図) came into use, but the term most widely used and associated… …
54Edward Wright (mathematician) — For the 20th century mathematician, see Edward Maitland Wright. Edward Wright Title page of the first edition of Wright s Certaine Errors in Navigation (1599) …
55Egypt, ancient — Introduction civilization in northeastern Africa dating from the 3rd millennium BC. Its many achievements, preserved in its art and monuments, hold a fascination that continues to grow as archaeological finds expose its secrets. This article… …
56tunnels and underground excavations — ▪ engineering Introduction Great tunnels of the world Great tunnels of the worldhorizontal underground passageway produced by excavation or occasionally by nature s action in dissolving a soluble rock, such as limestone. A vertical opening …
57James Cook — This article is about the British explorer. For other uses, see James Cook (disambiguation). Captain Cook redirects here. For other uses, see Captain Cook (disambiguation). James Cook …
58Sector (instrument) — The sector, also known as a proportional compass or military compass, was a major calculating instrument in use from the end of the sixteenth century until the nineteenth century. It is an instrument consisting of two rulers of equal length which …
59flight, history of — ▪ aviation Introduction development of heavier than air flying machines. Important landmarks and events along the way to the invention of the airplane include an understanding of the dynamic reaction of lifting surfaces (or wings), building… …
60Schiehallion experiment — Schiehallion s isolated position and symmetrical shape lent well to the experiment The Schiehallion experiment was an 18th century experiment to determine the mean density of the Earth. Funded by a grant from the …
