I greatly admire the old NACA and NASA researchers. Some of their reports are real literature, as well as being well conceived. Their research techniques were so thorough that when things like tunnel wall interference were found to affect seemingly remotely related parameters, they just jumped in and found corrections. Their techniques in some instances had to be conceived mathematically from scratch and translated into methods for handling data and creating tools for others to use. Computers were a thing of the far future, and their techniques were made transparent to all. I've used them often for my personal projects and to satisfy curiosity about things they probably didn't consider. Those model makers had to be fine workers to achieve the accuracy and finish necessary for their tasks. I suppose I'm solidifying my nerd-ish status, but I have spent some really exciting and happy times in old library stacks with these guys' works. 'very special people working in exciting, hands-on times. The picture shows a lot of that, and I'm sure the memories are very special for you.