alb3816576

Cross-staff, Navigational Instrument

The term cross-staff, also Jacob's staff, ballastella, balestilha, or fore-staff is used to refer to several things. The two most frequent uses are: in astronomy and navigation for a simple device to measure angles, and in surveying for a vertical rod that penetrates the ground and supports a compass or other instrument. The cross-staff consisted of a long staff with a perpendicular vane which slides back and forth upon it. The staff is marked with graduated measurements - calculated by trigonometry. The angles can then be measured by holding it so the ends of the vane are level with the points to be measured. Early in the sixteenth century it was already in use as a seaman's navigational instrument.

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Título: Cross-staff, Navigational Instrument

Descripción: Ver traducción automática
The term cross-staff, also Jacob's staff, ballastella, balestilha, or fore-staff is used to refer to several things. The two most frequent uses are: in astronomy and navigation for a simple device to measure angles, and in surveying for a vertical rod that penetrates the ground and supports a compass or other instrument. The cross-staff consisted of a long staff with a perpendicular vane which slides back and forth upon it. The staff is marked with graduated measurements - calculated by trigonometry. The angles can then be measured by holding it so the ends of the vane are level with the points to be measured. Early in the sixteenth century it was already in use as a seaman's navigational instrument.

Crédito: Album / Science Source / New York Public Library

Autorizaciones: ? Cesión de modelo: No - ? Cesión de propiedad: No
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Tamaño imagen: 4800 × 3137 px | 43.1 MB

Tamaño impresión: 40.6 × 26.6 cm | 1889.8 × 1235.0 in (300 dpi)

Palabras clave: ARTE • BLANCO Y NEGRO • CIENCIA • DIAGRAMA • DIBUJO • FAMOSA • FAMOSO • FAMOSOS • FONDO BLANCO • GRABADO EN MADERA • HERRAMIENTA • HISTORIA • HISTORICO • ILUSTRACION • ILUSTRACIONES • IMPORTANTE • INSTRUMENTO • MARITIMO • NÁUTICO • NAVEGACION • OBRA DE ARTE • PLANCHA DE MADERA • S. XVI • SIGLO XVI • XILOGRAFIA