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1929年,由德国生产的“容克”G-38大型旅客机,装有4台功率为60马力的发动机,起飞重量为20吨。该机采用全金属机身(邮票十五)。 1931年5月27日,载人气球首次升入同温层。瑞士科学家皮卡德设计了一个直径约2.1米的圆形密封吊舱,由充有氢气的气球带上了15791米的高空。这个密封吊舱是用铝合金制成的圆球,在球面上开有几个直径约10厘米的玻璃窗,以便于向外观察。他们在飞行中,还进行了科学研究,如对宇宙射线的研究(邮票十四)。
In 1929, the “Juncker” G-38 passenger aircraft produced by Germany equipped with four engines of 60 horsepower and a take-off weight of 20 tons. The machine uses all-metal body (stamp fifteen). May 27, 1931, the first manned balloon into the stratosphere. Swiss scientist Picard designed a circular sealed pod about 2.1 meters in diameter and carried 15,981 meters above the balloon filled with hydrogen. This sealed pod is made of aluminum alloy balls, spherical in the open several about 10 cm in diameter glass for easy observation. During their flight, they also conducted scientific research, such as the study of cosmic rays (Stamp XIV).