micrometer

344-359) describes a micrometer in which a negative lens is introduced between the eye-piece and the objectglass.

双重图象微表与透镜。各各样微表被发明了除heliometer 以外为量由重象。Ramsdens 屈光微表包括一个透镜被安置在一台地球望远镜架设眼睛管最内在透镜共轭焦点。

The coiled shapes of Trichinella isolated ML were observed under microscopes,then the lengths and widths of ML encystment(encysted index)were measured at random by micrometer.

镜下观察旋毛虫幼虫卷曲状态,用微尺随机量囊包长、宽。