{"product_id":"ww2-negretti-zambra-air-ministry-vane-anemometer-am-no-10a-10164","title":"WW2 Negretti \u0026 Zambra Air Ministry Vane Anemometer AM No. 10A\/10164","description":"\u003ch1 class=\"override-listing-title normal break-word mb-xs-2\" data-buy-box-listing-title=\"\" data-listing-id=\"675896204\"\u003eWW2 Negretti \u0026amp; Zambra Air Ministry Vane Anemometer AM No. 10A\/10164\u003c\/h1\u003e\n\u003cp\u003eThis wonderful looking antique scientific instrument is a 4-inch WW2 Negretti \u0026amp; Zambra Air Ministry Vane Anemometer AM No. 10A\/10164.\u003c\/p\u003e\n\u003cp\u003eIt has 8 vanes and 3 Measuring Dials showing feet in hundred's, thousand's, and 10 thousand's. It has an on\/off lever and a zero reset button. It appears to be working but I can't attest to its accuracy.\u003c\/p\u003e\n\u003cp\u003eThis 4-inch Biram Vane Anemometer No. B22730 was last calibrated on the 11th June 1946 by the Aerodynamics section of the National Physical Laboratory, Teddington. The test certificate is included.\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003eApproximate Size:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDiameter of Anemometer No. B22730: 10.3cm \/ 4\"\u003c\/li\u003e\n\u003cli\u003eDial Diameter: 5.1cm  (2\")\u003c\/li\u003e\n\u003cli\u003eLeather Transit Case labelled \u003cmeta charset=\"utf-8\"\u003e10A\/10614\u003c\/li\u003e\n\u003cul\u003e\n\u003cli\u003eWidth: 13.2 cm Depth: 5.2 cm Height: 13 cm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/ul\u003e\n\u003cp\u003ewhere \u003cspan\u003e10A = Miscellaneous Radio (Wireless) Equipment\u003c\/span\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003eThe blackened brass has faded in places, and there are surface scuffs and scratches commensurate with age and use. The test certificate is very grubby but legible. A very high quality measuring instrument and nice WW2 Air Ministry artefact for the industrial themed home.\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003eAlso known as a Wind \/ Air Speed Flow Meter, it would have been used on an airfield. Non-military versions were also extensively used in mines.\u003c\/p\u003e\n\u003cp\u003ePlease click on the following links for more \u003ca href=\"https:\/\/mullardantiques.co.uk\/collections\/aircraft-collectibles-aviation-aeronautica\" target=\"_blank\"\u003eaviation related ephemera\u003c\/a\u003e or \u003ca href=\"https:\/\/mullardantiques.co.uk\/collections\/meteorological-weather\" target=\"_blank\"\u003emeteorological instruments\u003c\/a\u003e. \u003c\/p\u003e\n\u003cp\u003eMechanical anemometers were a piece of safety equipment, invented by \u003cstrong\u003e\u003ca href=\"https:\/\/www.gracesguide.co.uk\/Benjamin_Biram\"\u003eBenjamin Biram\u003c\/a\u003e\u003c\/strong\u003e in 1844, to determine the volume of air entering or exiting mine workings. They were produced in 2 styles; Biram style which have the dials and vanes on the same plane and the offset style which has the dials perpendicular to the vanes. \u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e","brand":"Negretti and Zambra","offers":[{"title":"Default Title","offer_id":44104346140929,"sku":null,"price":0.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0303\/5122\/8972\/files\/DSC07528_1.jpg?v=1698245188","url":"https:\/\/mullardantiques.co.uk\/en-us\/products\/ww2-negretti-zambra-air-ministry-vane-anemometer-am-no-10a-10164","provider":"Mullard Antiques and Collectibles","version":"1.0","type":"link"}