| 摘要 |
<p>Disclosure relates to a method by which it is possible by way of impulse-echo technique, to indicate the existance of reflections along a given first line in the form of luminous points along a given second line. The invention resides in that the indications by means of an arrangement of one or more mirrors are shown as imaginary luminous points situated preferably on the very point in an object where a reflecting structure is actually found.</p> |
