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Bradshaw, George

(Encyclopedia)Bradshaw, George, 1801–53, English map engraver and the originator of railway guides. Bradshaw's Railway Time-Tables, first published in 1839, became Bradshaw's Monthly Railway Guide (first issued 1...

astrolabe

(Encyclopedia)astrolabe ăsˈtrəlāb [key], instrument probably used originally for measuring the altitudes of heavenly bodies and for determining their positions and movements. Although its origin is ancient and ...

chart

(Encyclopedia)chart, term referring to maps prepared for marine navigation and for air navigation. All charts show, in some convenient scale, geographic features useful to the navigator, as well as indications of d...

Sloane, T(homas) O'Conor

(Encyclopedia)Sloane, T(homas) O'Conor, 1851–1940, American scientist, lecturer, writer, and periodical editor, Ph.D. Columbia, 1876. Sloane was a member of the editorial staff of the Scientific American, where h...

isotherm

(Encyclopedia)isotherm, line drawn on a map of a particular region of the earth's surface connecting points of equal temperature; each point reflects one temperature reading or an average of several readings over a...

Gwilt, Joseph

(Encyclopedia)Gwilt, Joseph gwĭlt [key], 1784–1863, British architect, archaeologist, and writer, known chiefly for his Encyclopaedia of Architecture, Historical, Theoretical, and Practical (8 vol., 1842). Among...

Arrowsmith, Aaron

(Encyclopedia)Arrowsmith, Aaron, 1750–1823, English cartographer and geographer. He founded the map-making and publishing business carried on by his sons and by his nephew John Arrowsmith, 1790–1873. John Arrow...

Idrisi

(Encyclopedia)Idrisi ĕ– [key], in full Abu Abdallah Muhammad Ibn Muhammad Ibn Abdallah Ibn Idris Al-Hammudi Al-Hasani Al-Idrisi, b. 1099?, d. after 1154, Arab geographer, b. Ceuta. He traveled in Europe, Asia Mi...

Dewing, Francis

(Encyclopedia)Dewing, Francis do͞oˈĭng, dyo͞oˈ– [key], fl. 1716–22, early American engraver, b. England. He came to Boston in 1716 as an engraver and printer, probably one of the first in America. In 1722 ...

Toscanelli, Paolo dal Pozzo

(Encyclopedia)Toscanelli, Paolo dal Pozzo päˈōlō däl pôtˈtsō tōskänĕlˈlē [key], 1397–1482, Italian cosmographer and mathematician. A physician by training, he was also known as Paul the Physician. He...