{"product_id":"david-rowland-s-patent-double-sextant-circle-charles-drewry-nautical-mag-1834-p-6-111198","title":"David Rowland’s patent double sextant \u0026 circle—Charles Drewry— Nautical Mag 1834","description":"\u003cp align=\"left\"\u003e'Rowland’s Patent Double Sextant and Circle (Fig. 1 \u0026amp; 2)'\u003c\/p\u003e\u003cp align=\"left\"\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp align=\"left\"\u003e\u003cem\u003eDavid Rowland designed a new version of double sextant, by means of which one observer could measure two angles between three points at once (patent no. 6528 of 1833).\u003c\/em\u003e\u003c\/p\u003e","brand":"Antiquemapsandprints.com","offers":[{"title":"Default Title","offer_id":52504274043227,"sku":"P-6-111198","price":54.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0923\/9583\/1643\/files\/P-6-111198a.jpg?v=1772563570","url":"https:\/\/www.antiquemapsandprints.com\/fr\/products\/david-rowland-s-patent-double-sextant-circle-charles-drewry-nautical-mag-1834-p-6-111198","provider":"Antiquemapsandprints.com","version":"1.0","type":"link"}