Made of two tiny tin beads usually used to calibrate electron microscope lenses, the snowman was built by the NationalPhysicalLaboratory.
这个雪人由英国国家物理实验室制造，使用的材料是通常用来校准电子显微镜透镜的锡珠。
2
He later worked at the NationalPhysicalLaboratory, creating one of the first designs for a stored-program computer, although it was never actually built.