Ye Olde Triang/Hornby R118 Bogie Well Wagon

[GoingUnderground]

17 hours ago, Fat Controller said:

If it is a blueprint, then check dimensions against the drawing. They are prone to shrinking and stretching. Those in the drawing office that my father worked in had 'DO NOT SCALE' printed on the bottom-centre of the page.

As a matter of principle, you should never scale, i.e .take measurements, from the drawing itself. The drawing should have all the dimensions marked anyway so there should be no need to scale.

 

I worked in a drawing office for 6 months once, preparing drawings. We had one engineer close to retiring age who had worked abroad for many years. Just before he retired I was asked to modify some of his drawings to reflect changes made since he had first drawn them. On starting to alter them as requested, none of the marked dimensions matched what was on the drawing. It wasn't until I checked his scale (ruler) against another one in the office that we found out that his scale, one he had been using for most of his working life, had shrunk.