{"id":3567,"date":"2016-03-03T09:47:56","date_gmt":"2016-03-03T16:47:56","guid":{"rendered":"https:\/\/www.caddmanager.com\/CMB\/?p=3567"},"modified":"2016-03-03T09:47:56","modified_gmt":"2016-03-03T16:47:56","slug":"pencil-lead-hardness","status":"publish","type":"post","link":"https:\/\/www.caddmanager.com\/CMB\/2016\/03\/pencil-lead-hardness\/","title":{"rendered":"Pencil Lead Hardness"},"content":{"rendered":"

I collect old books.\u00a0 Not rare books or expensive books, just old, used books. I love the smell of a used book shop. I love finding unique items that I think are interesting (others may find them dull). I have a lot of old bibles, dictionaries and encyclopedias. I tend to like technical\/reference books. I have and extensive collection. Nothing overly impressive. Just things I like.\u00a0 I select them based on many factors. The binding, cover, graphics inside, content, topic, outdated perspectives and more.\"Mechanical_Eng\"<\/p>\n

Since it is Throw Back Thursday, I decided to post on this topic with a quick reference from one of my finds.<\/p>\n

The Hardness of Lead in your Pencils. For artists, this is still a current topic. For drafters, not so much. But if you are ever in need of knowing which lead is harder or softer… here you go.<\/p>\n

I purchased the seventh edition of the Standard Handbook for Mechanical Engineers (c) 1967. It has a wealth of great info, like (nerd warning) Heat Transfer calculations, Fluid and Solid Mechanics, Surfaces and volumes,\u00a0 Copper wire resistance, Vibration effects, Geometry and Trigonometry.<\/p>\n

This was inside the cover of a book I bought. Written by a prior owner of the book.<\/p>\n

\"Lead_List\"<\/p>\n

Here is a chart of the same info – from draftingmanuals.tpub.com <\/span><\/a><\/span><\/p>\n

\"Pencil_lead_hardness\"<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

I collect old books.\u00a0 Not rare books or expensive books, just old, used books. I love the smell of a used book shop. I love finding unique items that I think are interesting (others may find them dull). I have a lot of old bibles, dictionaries and encyclopedias. I tend to like technical\/reference books. I […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[42],"tags":[],"series":[],"class_list":["post-3567","post","type-post","status-publish","format-standard","hentry","category-whatever"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t