Using old photographs to compute model size:
I was not really sure exactly where to post this topic:
This is by no means a definitive primer on how to utilize old photos when building a model. This is simply an outline of part of the process I went thru in determining measurement for a new Mack NO6 Artillery Tractor I wanted to build.
Ah, it is heavenly to find an almost prefect profile photo of the vehicle you happen to be interested in!
You then need to look for a known measurement in the photo such as the diameter of the tire rim. (not the tire but the rim - never trust the tire diameter!) You can then create a measuring scale based on that single known measurement.
Also books like Doyle’s “Standard Catalogue of US Military Vehicles” can give you basic overall vehicle dimensions. (Also available electronically.)
This is the photo I used to start my Mack NO project:
The Mack rode on 24 inch wheel rims but what you see here in the photo includes the lip around the circumference of the rim so in using this value you have to subtract approximately 3 inches from what you see here to get your scaling measurement of 24 inches. - If you forget to subtract that 3 inches your scale will end up being about 12% too large and your model will then come out 12% too small.*