|Object:||Alidade (More lots)|
|Manufacturer/ Brand:||U.S. Navy|
|Country of Origin:||U.S.|
|Condition:||Good condition - used with small signs of aging & blemishes|
The name ‘alidade’ comes from Arabic.
Before Arab astronomy spread to late medieval Europe, the ‘alidade’ was called ‘diottra’ (from the Greek “dia” = “through” and “opteyo” = “to observe”, from which ‘dioptre’ - instrument through which something is observed).
The term ‘alidade’ originally designated a revolving small rod with levels, centred in a goniometric scale drawn on the front or back flat face of many ancient astronomical and topographical instruments: dials, flat astrolabes, graphometers and so on.
Into the alidade there are two vanes (or pinnules), fixed perpendicularly on the circle of the alidade itself, which allows to aim at or watch an object that is a reference point on the coast, (e.g. a bell tower) through the holes made in them.
The vane has a narrow slit to which the eye is placed and through which the observation is carried out.
A prism allows you to read the value of the bearing on the compass.
An index, often made of the edge of the alidade itself, shows on a goniometric scale (azimuthal circle), the angle (azimuth) between the line of sight of the targeted object and a predetermined direction.
Body to be repainted.
Catawiki member since May 20, 2019, received 5 reviews in total (5 in last 12 months)
Please note: some elements on this page have been translated automatically.scatota in legno danneggiata (tarli, rotture etc.). Dischi di cartoncino (parte importante dell'articolo) in condizioni pietose muffa, macchie di unto ? e comunque sporcizia impregnata sulla carta !
Please note: some elements on this page have been translated automatically.Venditore impeccabile: spedizione immediata. L'oggetto era in condizioni migliori di quelle indicate. Un acquisto al di sopra delle aspettative. Ok !
Please note: some elements on this page have been translated automatically.Transazione perfetta!
Spedizione rapida e oggetto perfettamente corrispondente alla descrizione
The seller will ship the item(s) within 3 working days after receiving confirmation of payment.
Shipping costs are for mainland destinations only.
Any other costs or charges such as customs or import duties, customs clearance and handling may also apply during the shipment of your lot and will be charged to you by the involved party at a later stage if applicable.
|Rest of Europe||$83.18|
If you win more than one lot sold by the same seller in the same auction, your shipment will be combined. In this case, only the shipping costs of whichever lot has the highest shipping costs will be applied.