Testing the balloon, 1957 Testing the strato-lab balloon in South Dakota, USA, 1957 (Uncredited photographer) | src National Geographic
Group of girls wear their gas-masks during a gas drill (emergency response exercise with gas masks), Moscow, 1930′s / src: Twitter related posts, here
V. Leers :: Test of parachute jumping conducted at the Eiffel tower in Paris with a dummy weighing 75 Kg. The device weighted 21 Kg. date: 18 February 1911. Published in Dutch magazine ‘De Prins der Geïllustreerde Bladen’ / source: wikimedia related post, here
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