micrometer

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

双重图象表与分镜。各各样表被发明了除heliometer 以外为量由重象。Ramsdens 屈光表包括一个分镜被安置在一台地球望远镜架设眼睛管最内在镜共轭焦点。

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,用尺随机量囊包长、宽。