A historical review of the modulus concept and its relevance to mechanical engineering design today

In this paper engineering drawing techniques are examined with a particular focus on the use of the modulus concept in design. Modulus concept here means a unit of measure based on experience and relation to key attributes from which all the design corresponds. This approach appears to be more familiar in architecture; however, less so in mechanical engineering. To illustrate this a historical review of the modulus concept is given and its applicability for today's mechanical engineering practise is shown. ► The modulus concept relates an artefact's proportions to a key functional dimension. ► Its evolution in engineering and relation to harmonious design are evidenced. ► Classes are used to overcome a nonlinear relation for its ratio. ► Its applicability to today's mechanical engineering practise and education is shown.