United States. Surgeon-General's Office, American Roentgen Ray Society · New York : Middleditch · leaf 168
escreen in the line of the vertical ray previously marked.If the screen did not rest on the skin at this point thedistance between them must be subtracted from thereading. Equal Shadow-shift. Jordans Method11 is based upon the fact that,given a surface (s) an object (o) and a distant light i(L)… … Fig. 10. Harets method. Diagram to show movement of shadow with two po-sitions of tube.
