micrometer

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

双重图象测的透镜。各各样的测发明了除heliometer 以外为测量由重象。Ramsdens 屈光的测包括一个的透镜安置在一台地球望远镜的架设的眼睛管的最内在的透镜的共轭焦点。

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,用测尺随机测量囊包长、宽。