[Offset staff].
Librería: Daniel Crouch Rare Books Ltd, London, Reino Unido
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Añadir al carritoLibrería: Daniel Crouch Rare Books Ltd, London, Reino Unido
Calificación del vendedor: 4 de 5 estrellas
Vendedor de AbeBooks desde 7 de noviembre de 2011
Cantidad disponible: 1 disponibles
Añadir al carritoDescripción
Surveyor's offset staff Mahogany staff (4 feet 9 inches) with steel shod pointed foot, the pole 1 inch dia., 4 inch dia. hard ball. A finely made example of an offset staff. The instrument consists of a turned wooden pole. At one end is a metal spike so that the pole can be easily driven into the ground. On the other end is a wooden ball with a cross-slight. The instrument was designed to measure off sets, that is, to locate objects that are at a 90 degree angle to the surveying centreline. N° de ref. del artículo 15107
Detalles bibliográficos
Título: [Offset staff].
Editorial: c1850.
Año de publicación: 1850
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