micrometer

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

双重图象测与分开的透。各各样的测被发明了除heliometer 以外为测量由重象。Ramsdens 屈光的测一个分开的透被安置在一台地球望远的架设的眼睛管的最内在的透的共轭焦点。

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.

下观察旋毛虫幼虫卷曲状态,用测尺随机测量囊长、宽。