micrometer

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

双重图象测微表与分开的透镜。各各样的测微表被发明了除heliometer 以外为测量由重象。Ramsdens 屈光的测微表包括个分开的透镜被安置地球望远镜的架设的眼睛管的最内的透镜的共轭焦点。

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,用测微尺随机测量囊包长、宽。