Part of: Casgliad Tirlun Cymru = Welsh Landscape Collection,
National Library of Wales.
Date supplied by cataloguer., Printed notes on print: 'Details of the suspension bridge: Total length of bridge, 910 feet; Height of roadway above high water mark, 100 feet; Height of the two main pillars, 153 feet; Suspended weight of iron, 489 feet; Total weight of iron, 2186 tons; Extreme length of chain, 1714 feet. Details of the tubular bridge: Total length of the bridge, 1834.0 feet; Height of rails above high water mark, 104.0 feet; Height of the Britannia tower, 221.8 feet; Weight of one of the main tubes including cast iron frames for stiffening at each end and lifted by hydraulic power, 1800 tons; Total weight of iron, 10,000 tons.
Computer file. Aberystwyth: National Library of Wales, 2003-2006. (Tirlun Cymru digitisation project). Original file captured in uncompressed TIFF format. Cropping, image size, unsharp masking, gamma correction and compression settings for screen res JPEG were made using Adobe Photoshop v6.0.1 and Abobe Imageready v3 Nexscan F4100; Linocolor v6; Black and White points set from GretagMacbeth colour chart; no validation; no encryption key; no watermark. Made from original items. Target resolution for hi-res capture was 300dpi at original size. In some cases this was increased to avoid moircaron effect; Screen-res copies use JPG commpression at approx 35%; 24bit color; Hi-res TIFFs in AppleRGB, Screen-res in sRGB; Apple Colorsync. No control targets.
2003-2006 ; scanned. Imaging Unit, National Library of Wales, Aberystwyth, Ceredigion.