Metals
Building: Roofs
Board Practice: Using the Tee Square and Set Square for Drawing Board; Horizontal and Vertical Lines
<h1>BOARD PRACTICE</h1> <p>CONTENT</p> <ol> <li>Using The Tee And Set Square For Drawing Board</li> <li>Horizontal And Vertical Lines</li> <li>Types of Lines and their Uses</li> </ol> <p> </p> <h2>Using The Tee And Set Square For Drawing Board</h2> <p>This is a practical topic. The teacher should DEMONSTRATE this as much as possible in class for the students</p> <p>The various uses of setsquares are given below:</p>
Geometric Construction: Construction of a Circle
Ceramics, Glass, Plastics and Rubber
Properties of Metals
<h1><strong>PROPERTIES OF METALS</strong></h1> CONTENT <ol> <li>The Definition of Metals</li> <li>Identification of Metals by Physical Properties</li> <li>Classification of Metals</li> </ol> <h2><strong>The Definition of Metals</strong></h2> A metal is a material (a compound, element or alloy) that is hard when in solid state, opaque, shiny, and which is a good conductor of heat and electricity. <h2><strong>Identification of Metals by Physical Properties</strong></h2> Identification of metals can be defined as a method used to differentiate one particular type of metal from another and from other materials which are non-metals. Metals can be identified through their properties, which include: <ol> <li>Density: This is the weight of a metal and it varies from metal to metal. E.g. aluminum is light and lead is heavy in weight.</li> <li>Colour/Lustre: This is the appearance of a metal when the surface is polished. For example, when polished and examined under a microscope, copper presents a different appearance from polished mild steel.</li> <li>Fusibility: This is the property of a metal which makes it melt and join with other metals while in a liquid form.</li>
Board Practice: Positioning and Drawing the Title Block; Freehand Writing of Letters and Numerals
<h1>BROAD PRACTICE</h1> <p>CONTENT</p> <ol> <li>Positioning and Drawing the Title Block.</li> <li>Freehand Writing of Letters and Numerals.</li> </ol> <p> </p> <h2>Positioning and Drawing the Title Block</h2> <h3>Title Block</h3> <p>The title block gives necessary information about the drawing such as name of designer, school, class, date, scale etc. The title block is usually at the bottom right-hand corner of the drawing paper.</p> <p><img class="size-full wp-image-32536 aligncenter" src="https://classhall.com/wp-content/uploads/2018/06/title-block.jpg" alt="Board practice - Positioning and Drawing the Title Block" width="522" height="227" /></p> <p> </p> <h2>Writing (freehand) Legible Letters and Numerals</h2> <p>Lettering is the art of writing of letters (alphabets) and numbers (figures) in bold form or lower case form on drawing.</p>
Geometric Construction: Tangents of a Circle
Isometric Drawing; Oblique Drawing
Basic Emission Theory
<h1><strong>BASIC EMISSION THEORY </strong></h1> CONTENT <ol> <li>Definition of Emission</li> <li>Electronic Emission</li> <li>Methods of Emission</li> </ol> <h2><strong>Definition of Emission </strong></h2> Emission is the displacement or dislodgement of electron from a material with the intention of directing such electron to a predetermined position or object. The basic electronic emission occurs when heat, sunlight, electron collision, electromagnetic field and surface bombardment are used to release electron from the metal surface to the vacuum tube. <h2><strong>Electronic Emission </strong></h2> The electronic emission is the process of liberating or emitting free electrons from the metal surface to the vacuum tubes. A vacuum tube is an empty tube in which the air has been completely removed for the purpose of storing liquefied gas. <h2><strong>Methods of Emission</strong></h2> There are four principal methods of liberating electron from the surface of metal. They are