ONLINE GLOSSARY

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• Half Round. One half of a cylinder, split lengthwise down the middle.
  
  
• Half Section. A section view where one half of the object is omitted to save space. This is most often done when the object in question is perfectly symmetrical, meaning it is not necessary to draw the entire object. See Section.
  
  
• Helix. A coil formed by wrapping a sloping line around a cylinder. A regular helix appears as a circle when viewed from directly above. See also Conical Helix.
  
  
• Hemisphere. One half of a sphere.
  
  
• Horizontal Plane. One of the three principal planes of projection that yields the top and bottom plan views. Since both views are parallel to one another, the plane of projection that yields the top plan view is parallel to the plane of projection that yields the bottom plan view. As a result, these planes of projection can be combined into a single plane known as the horizontal plane.

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0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Click on a letter to browse through the Glossary terms.
To download a printable version of the entire Glossary, click here.

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