<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><p style="margin: 0px 0px 2px; text-indent: 6px; font-stretch: normal; line-height: normal;" class="">Between 1643 and 1689, John Wallis served as chief cryptographer for Parliament and, later, the royal court. He is also credited with introducing the symbol ∞ for infinity.</p><p style="margin: 0px 0px 2px; text-indent: 6px; font-stretch: normal; line-height: normal;" class=""><font face="Helvetica Neue" class=""><span style="caret-color: rgba(0, 0, 0, 0.5); color: rgba(0, 0, 0, 0.5);" class=""><br class=""></span></font></p><p style="margin: 0px 0px 2px; text-indent: 6px; font-stretch: normal; line-height: normal;" class=""><font face="Helvetica Neue" class=""><span style="caret-color: rgba(0, 0, 0, 0.5); color: rgba(0, 0, 0, 0.5);" class=""><a href="https://www.atlasobscura.com/articles/john-wallis-cryptography" class="">https://www.atlasobscura.com/articles/john-wallis-cryptography</a></span></font></p><div class=""><br class=""></div><div class="">reports</div><p style="margin: 0px 0px 2px; text-indent: 6px; font-stretch: normal; line-height: normal; font-family: "Helvetica Neue"; color: rgba(0, 0, 0, 0.5);" class=""><br class=""></p><p style="margin: 0px 0px 2px; text-indent: 6px; font-stretch: normal; line-height: normal; font-family: "Helvetica Neue"; color: rgba(0, 0, 0, 0.5);" class="">"<span style="color: rgb(56, 44, 20); font-family: "Freight Pro", serif; font-size: 19px; font-variant-ligatures: common-ligatures; orphans: 2; widows: 2; background-color: rgb(239, 232, 220);" class="">On October 7, 2020, </span><a href="https://www.dominicwinter.co.uk/Auction/Lot/375-wallis-john-a-collection-of-letters-intercepted-in-cipher-during-the-late-warres-in-england-1653/?lot=361781&so=2&st=&sto=0&au=751&ef=&et=&ic=False&sd=0&pp=24&pn=1&g=1" style="box-sizing: border-box; background-color: rgb(239, 232, 220); color: rgb(56, 44, 20); text-decoration: none; box-shadow: rgba(173, 143, 104, 0.6) 0px -2px 0px inset; font-family: "Freight Pro", serif; font-size: 19px; font-variant-ligatures: common-ligatures; orphans: 2; widows: 2;" class="">Dominic Winter Auctioneers</a><span style="color: rgb(56, 44, 20); font-family: "Freight Pro", serif; font-size: 19px; font-variant-ligatures: common-ligatures; orphans: 2; widows: 2; background-color: rgb(239, 232, 220);" class=""> in England sold a collection of 53 letters deciphered by Wallis, for £29,000 (roughly $37,000)."</span></p><div class=""><br class=""></div><div class=""><br class=""></div></body></html>