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344-359) describes a micrometer in which a negative lens is introduced between the eye-piece and the objectglass. 雙重圖象測微表與分開的透鏡。各種各樣的測微表被發明了除heliometer 以外爲測量由重象。Ramsdens 屈光的測微表包括一個分開的透鏡被安置在一台地球望遠鏡的架設的眼睛琯的最內在的透鏡的共軛焦點。