作者: William E Lyon
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摘要: A 90-100 percent reflective first surface mirror is disposed to direct a reflected image 70 reflective, 30 transmitting beam splitter which reflects the along light path parallel of true thereby produce two separate full view images. The and are directed through magnifying telescope having infinite projected crossed vertical horizontal reticles. rotatable change displacement from reticle when images equally displaced reticle, range may be found by triangulation.