Dilute solutions of a simple, coil-like polymer in a volatile solvent are cast on a glass slide in the presence of moist air flowing across the surface.
简单的无规线团状态聚合物溶解在挥发性的溶剂配置成稀溶液，在有潮湿空气在表面流动时浇铸到玻璃片上。
2
A Helmholtz coil is installed on the base sliding block through the coil fixed plate and can slide freely on the base guide rail.