Finally, it all packs up into a nicely hand mitred MAPLE box with a small window, and the only thing exposed is a windup key like a Cuckoo clock. Wind it up, set the altitude to ground level and when you flip the switch, it starts ticking ... and slowly the pen starts inking the current altitude.
The box has several ropes with brass clasps needed to suspend it from the aircraft in some protected space, and on the outside there is a window with an early form of acetate plastic over it, again nicely mitred into place and another folder like sleve to hold the tunning info when the bellows needs to be adjusted.
On the whole it's actually quite a little work of art and I found it less than 5 days after returning from the Lafayette Foundation in Denver.
What are the odds
