[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-648523-105":59,"doc-detail-648523-en":134},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":127,"head_meta":129,"extra_data":131,"updated_unix":133},105,"en","mech-220-2nd-lecture-orthographic-drawings","MECH 220 - 2nd LECTURE - Orthographic Drawings","","Lecture notes for MECH 220 focused on orthographic drawings and projection fundamentals. The material reviews the lecture overview and conventions, then explains orthographic projection concepts such as transferring dimensions, view selection, and representation of geometric entities, including a sketching exercise. It also provides historical context on Gaspard Mongne and outlines engineering drawing as a combination of graphics language and word language. Projection theory is detailed via line of sight and projection planes, comparing parallel and perspective projection.",{"@graph":69,"@context":126},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":30,"@type":76,"position":81},"https://docshare.wps.com/document/technology/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/mech-220-2nd-lecture-orthographic-drawings/648523/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/mech-220-2nd-lecture-orthographic-drawings/648523.png","ImageObject",300,407,{"name":92,"@type":93},"nayy☆","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-26","2026-10-23",true,{"@type":102,"interactionType":103,"userInteractionCount":14},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118,122],{"name":109,"@type":110,"acceptedAnswer":111},"What are the main topics covered in the 2nd MECH 220 lecture?","Question",{"text":112,"@type":113},"The lecture covers overview and available convention, orthographic projection, transferring dimensions, drawing curved shapes, selecting views, geometric entities representation, and a sketching exercise.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How is engineering drawing described in these notes?",{"text":117,"@type":113},"Engineering drawing is presented as two languages: graphics language to describe a shape, and word language to describe size, location, and specifications of the object.",{"name":119,"@type":110,"acceptedAnswer":120},"What does projection theory explain, and which variables does it use?",{"text":121,"@type":113},"Projection theory explains how to graphically represent 3-D objects on 2-D media. It is based on line of sight and the plane of projection (image plane/picture plane).",{"name":123,"@type":110,"acceptedAnswer":124},"What is the difference between parallel and perspective projection?",{"text":125,"@type":113},"Line of sight has two types: parallel and converge. The notes also distinguish projection by whether the plane of projection creates an image for parallel projection versus perspective projection.","https://schema.org",{"og:url":83,"og:type":128,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":130,"canonical":83},"index,follow",{"doc_id":132,"site_id":62},648523,1793030021,{"code":4,"msg":5,"data":135},{"doc_id":132,"user_id":136,"nickname":92,"user_avatar":137,"doc_module":4,"category_id":29,"category_name":30,"doc_title":65,"doc_description":67,"doc_content":138,"file_id":139,"file_url":140,"file_type":141,"file_size":142,"view_count":14,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":143,"language":144,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":145,"faqs":146,"seo_title":147,"seo_description":67,"update_tm":148,"read_time":149},962090893153,"https://ap-avatar.wpscdn.com/davatar_9964176cb1d06d4a9deccf72a44ae3dc","MECH 220 Engineering Graphics  \nOrthographic Drawings  \nSpring 2009-10  \nInst.: Abed Alkader Al Saidi  \nOffice: IOEC room 411  \nExtension: 3504  \ne-mail: [aa166@aub.edu.lb](aa166@aub.edu.lb)  \nInst. AbedAlkader Alsaidi, MECH 220 14/09/2017 1  \nMECH 220: 2nd LECTURE  \nTopics  \n􀂋 Overview  \n􀂋 Available Convention  \n􀂋 Orthographic Projection  \n􀂋 Transferring Dimensions  \n􀂋 Drawing Curved Shapes  \n􀂋 Selecting Views  \n􀂋 Geometric Entities Representation  \n􀂋 Sketching Exercise  \nInst. AbedAlkader Alsaidi, MECH 220 14/09/2017 2  \nMECH 220: 2nd LECTURE History  \n􀂋 Orthographic Projection was formalized by Gaspard Mongne (b. 1746) .  \n􀂋 Mongne worked as a drafter in the fortification design office of the school at Mezier for French army officers  \n􀂋 His work was kept a military secret for a number of years until he was allowed to publish in 1795.  \n􀂋 Stone cutters were the first to adopt his methods. Later carpentersand other trades abandoned their old methods for orthographic projection.  \nInst. AbedAlkader Alsaidi, MECH 220 14/09/2017 3  \nElements of Engineering Drawing  \nEngineering drawing are made up of graphics language and word language.  \nGraphics language  \nDescribe a shape (mainly) .  \nWord language  \nDescribe size, location and specification of the object.  \nInst. AbedAlkader Alsaidi, MECH 220 14/09/2017 4  \nBasic Knowledge for Drafting  \nInst. AbedAlkader Alsaidi, MECH 220 14/09/2017 5  \nPROJECTION METHOD  \nInst Abed Alsaidi,  \n220  \n14/09/2017  \n6  \nPROJECTION THEORY  \nThe projection theory is used to graphically represent 3-D objects on 2-D media (paper, computer screen) .  \n The projection theory is based on two variables:  \n1) Line of sight  \n2) Plane of projection (image plane or picture plane)  \nInst. AbedAlkader Alsaidi, MECH 220 14/09/2017 8  \nLine of sight is an imaginary ray of light between an observer’s eye and an object.  \nThere are 2 types of LOS : parallel and converge  \nParallel projection  \nLine of sight  \nPerspective projection  \nLine of sight  \nInst. AbedAlkader Alsaidi, MECH 220 14/09/2017 9  \nPlane of projection is an imaginary flat plane which the image is created.  \nThe image is produced by connecting the points where the LOS pierce the projection plane.  \nParallel projection  \nPlane of projection  \nPerspective projection  \nPlane of projection  \nInst. AbedAlkader Alsaidi, MECH 220 14/09/2017 10","cbCaibu4Yn0D6ixQ","https://ap.wps.com/l/cbCaibu4Yn0D6ixQ","pdf",4104349,54,"English","# Topics\n## Overview\n## Available Convention\n## Orthographic Projection\n## Transferring Dimensions\n## Drawing Curved Shapes\n## Selecting Views\n## Geometric Entities Representation\n## Sketching Exercise\n# Orthographic Projection History\n# Elements of Engineering Drawing\n# Basic Knowledge for Drafting\n# PROJECTION METHOD\n## PROJECTION THEORY\n## Line of sight\n## Plane of projection","[{\"question\":\"What are the main topics covered in the 2nd MECH 220 lecture?\",\"answer\":\"The lecture covers overview and available convention, orthographic projection, transferring dimensions, drawing curved shapes, selecting views, geometric entities representation, and a sketching exercise.\"},{\"question\":\"How is engineering drawing described in these notes?\",\"answer\":\"Engineering drawing is presented as two languages: graphics language to describe a shape, and word language to describe size, location, and specifications of the object.\"},{\"question\":\"What does projection theory explain, and which variables does it use?\",\"answer\":\"Projection theory explains how to graphically represent 3-D objects on 2-D media. It is based on line of sight and the plane of projection (image plane/picture plane).\"},{\"question\":\"What is the difference between parallel and perspective projection?\",\"answer\":\"Line of sight has two types: parallel and converge. The notes also distinguish projection by whether the plane of projection creates an image for parallel projection versus perspective projection.\"}]","MECH 220 - 2nd LECTURE - Orthographic Drawings | PDF",1792793921,136]