{"id":4520,"date":"2025-11-28T15:37:04","date_gmt":"2025-11-28T20:37:04","guid":{"rendered":"https:\/\/webref.org\/wp\/?p=4520"},"modified":"2025-11-28T19:04:07","modified_gmt":"2025-11-29T00:04:07","slug":"biconical-drilling","status":"publish","type":"post","link":"https:\/\/webref.org\/wp\/biconical-drilling\/","title":{"rendered":"biconical drilling"},"content":{"rendered":"<p><!--StartFragment --><\/p>\n<p><strong>Biconical drilling<\/strong> is an ancient technique used to perforate stone, bone, shell, and other hard materials by drilling from both sides of an object, producing a hole that is wider at the surfaces and narrower in the middle. It is a diagnostic feature in archaeology, especially for beads, pendants, and other ornaments.<\/p>\n<hr \/>\n<h2>\ud83c\udf0d Definition<\/h2>\n<ul>\n<li><strong>Biconical Drilling<\/strong>: A method of creating a perforation by drilling from opposite sides of an artifact.<\/li>\n<li><strong>Resulting Hole<\/strong>: Hourglass-shaped (wider at both openings, tapering toward the center).<\/li>\n<li><strong>Tools Used<\/strong>: Stone drills, reed drills with abrasive slurry (sand, quartz), or metal points in later periods.<\/li>\n<\/ul>\n<hr \/>\n<h2>\ud83d\udd11 Archaeological Contexts<\/h2>\n<ul>\n<li><strong>Beads &amp; Pendants<\/strong>:\n<ul>\n<li>Common in Neolithic and Bronze Age ornaments.<\/li>\n<li>Biconical perforations are diagnostic of hand-drilling techniques.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Stone &amp; Shell Artifacts<\/strong>:\n<ul>\n<li>Shell beads often show biconical holes from reed drills with sand abrasives.<\/li>\n<li>Hard stones like carnelian or turquoise required repeated drilling from both sides.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Diagnostic Feature<\/strong>:\n<ul>\n<li>Archaeologists identify biconical drilling by examining perforation cross-sections.<\/li>\n<li>Helps distinguish ancient hand-drilling from modern machine drilling (which produces straight cylindrical holes).<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<hr \/>\n<h2>\ud83d\udcda Importance in Anthropology<\/h2>\n<ul>\n<li><strong>Technological Insight<\/strong>: Reveals the ingenuity of early craftspeople in working hard materials.<\/li>\n<li><strong>Cultural Identity<\/strong>: Distinct drilling styles can be linked to specific cultures or regions.<\/li>\n<li><strong>Comparative Value<\/strong>: Highlights differences between prehistoric drilling methods (biconical, bow-drill, tubular drilling) and modern techniques.<\/li>\n<li><strong>Material Culture<\/strong>: Beads and ornaments with biconical holes often carried symbolic or social significance (status, trade, ritual).<\/li>\n<\/ul>\n<hr \/>\n<p><strong>In short: Biconical drilling is the ancient practice of perforating artifacts from both sides, producing hourglass-shaped holes that are diagnostic of hand-drilling techniques in beads, ornaments, and tools.<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p><!--EndFragment --><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Biconical drilling is an ancient technique used to perforate stone, bone, shell, and other hard materials by drilling from both sides of an object, producing a hole that is wider at the surfaces and narrower in the middle. It is a diagnostic feature in archaeology, especially for beads, pendants, and other ornaments. \ud83c\udf0d Definition Biconical &hellip; <a href=\"https:\/\/webref.org\/wp\/biconical-drilling\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;biconical drilling&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[36],"tags":[],"class_list":["post-4520","post","type-post","status-publish","format-standard","hentry","category-anthropology"],"_links":{"self":[{"href":"https:\/\/webref.org\/wp\/wp-json\/wp\/v2\/posts\/4520","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/webref.org\/wp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/webref.org\/wp\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/webref.org\/wp\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/webref.org\/wp\/wp-json\/wp\/v2\/comments?post=4520"}],"version-history":[{"count":1,"href":"https:\/\/webref.org\/wp\/wp-json\/wp\/v2\/posts\/4520\/revisions"}],"predecessor-version":[{"id":4521,"href":"https:\/\/webref.org\/wp\/wp-json\/wp\/v2\/posts\/4520\/revisions\/4521"}],"wp:attachment":[{"href":"https:\/\/webref.org\/wp\/wp-json\/wp\/v2\/media?parent=4520"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/webref.org\/wp\/wp-json\/wp\/v2\/categories?post=4520"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/webref.org\/wp\/wp-json\/wp\/v2\/tags?post=4520"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}