It represents a method for broad application that is not intended to be accurate for every situation. Whatever the application, a rule of thumb can be considered as a general principle or means of estimation derived from practice and experience, rather than precise theory. These include woodworkers using their thumbs as measurement devices, millers assessing the coarseness of ground flour by rubbing it between a thumb and forefinger, brewers testing the temperature of fermenting beers and farmers sowing seeds or setting plants at an approximate soil depth.
It is an expression that has been attributed to a diverse range of sources dating back hundreds of years. The origin of the term rule of thumb is unclear. This is exactly what BSRIA has done in order to produce the latest version of its immensely popular ‘Rules of thumb’ document.
Just imagine how useful it would be if someone took the time to research the latest design, cost and energy performance guidance for the built environment, consulted extensively with leading manufacturers and construction project teams about space and weight requirements for buildings-services plant - and then presented it all in a set of easy-to-read charts and tables. What they won’t have is the breadth and depth of figures that have been brought together by BSRIA - as Glenn Hawkins explains. The power or rules of thumb - Glenn Hawkins.Įvery engineer needs a feel for figures to enable him to sketch out designs and check that figures in designs are realistic.
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