HORIZONTAL AND VERTICAL MEASUREMENTS PROFESSIONAL ENGLISH IN USE FOR ENGINEERING

 

PROFESSIONAL ENGLISH IN USE FOR ENGINEERING UNIT 4. HORIZONTAL AND VERTICAL MEASUREMENTS

 

A Linear dimensions The web page shows they dimensions of the Airbus A380 in metres, and the explanations below it describe how they are measured. In the explanations, the word plane means imaginary surface (not an aeroplane). On drawings, planes are shown as lines that indicate where dimensions are measured from and to, and are positioned to strike (touch) the faces 9edges of surfaces) of components. Often, they are either horizontal planes or vertical planes. B Level and plumb If a surface is described as being level, this means is both horizontal and flat (smooth). However, a surface which is flat is not necessarily horizontal. A flat surface may be vertical, or inclined (sloping at an angle to the horizontal or vertical plane).     EXERCISES 4.1 Complete the key dimensions of the Millau Viaduct in France, using the words in the box. Look at A opposite to help you. height overall thickness span width 4.2 Decide whether the sentences about the viaduct are true or false, and correct the false sentences. Look at A and B opposite to help you. 1. The height of the towers is measured horizontally. 2. The overall span is measured along the width of the bridge. 3. The tops of the towers are at different levels, so a horizontal plane striking the top of one tower will not strike the tops of all the others. 4.3 Circle the correct words to complete the text about extra-high voltage (EHV) power lines. Look at A and B opposite to help you. The first one has been done for you. On EHV transmission lines, cables – called conductors – (1) incline/span between pylons, which are described as supports. The conductors are suspended from the supports by rods, called insulators. On straight sections of line, the insulators are (2) level/plumb, hanging vertically 4.4 Read the text below. Can you answer the questions?

ANSWER KEY