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Over the past two centuries, eight observatories have existed in the United Kingdom, which measured the daily field variations using light\u2010sensitive photographic paper to produce analogue magnetograms. Around 350,000 magnetograms have been digitally photographed at high resolution. However, converting the traces to digital values is difficult and time consuming as the magnetograms can have over\u2010lapping lines, low quality recordings and obscure metadata for conversion to SI units. We discuss our approach to digitizing the traces from large geomagnetic storms and highlight some of the issues to be aware of when capturing magnetic information from analogue measurements. These include cross\u2010checking the final digitized values with the recorded hourly mean values from observatory year books and comparing several observatory records for the same storm to catch errors such as sign inversions or incorrect \u2018wrap\u2010around\u2019 of data on the paper records.<\/jats:p>","DOI":"10.1002\/gdj3.151","type":"journal-article","created":{"date-parts":[[2022,3,28]],"date-time":"2022-03-28T18:22:39Z","timestamp":1648491759000},"page":"73-86","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Digitizing UK analogue magnetogram records from large geomagnetic storms of the past two centuries"],"prefix":"10.1002","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2298-0578","authenticated-orcid":false,"given":"Ciaran D.","family":"Beggan","sequence":"first","affiliation":[{"name":"British Geological Survey  Edinburgh 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