tained for nearly two hours-and until the constantly varying succession of minute openings be- intervenes, as shown in the drawing. At A and O, twelve-inch mirrors are mounted.on ball-bearing trun- tween their surfaces is presented, due to the incisions experiment was stopped by the exhaustion of… … reflection and re- The small circular pictures show respectively an image of a'face transmittea Turough several rooms and back again ; a swiveled hood on a house-top, containing junct to the ».mirfor.; a receivingitation with telescopic eye-piece, fraction are taken .equipment of sea- into proper…
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