. X-rays simply explained : a handbook on Röntgen rays in theory and practice . C CFig. 8. the images of negatives or prints of any reason-able size. A very simple arrangement of two mirrors at rightangles and a pair of drawing boards propped againstbooks will act as a stereoscope for viewing largerprints, such, for instance, as those given, and themethod employed is indicated in plan in fig. 8, whereA A are the prints, B B the mirrors, and C C theeyes of the observer. It will l)e obvious that theprints must be equidistant from the mirrors and 102 X-HAVS ) oxiutlv t»»osiU
. X-rays simply explained : a handbook on Röntgen rays in theory and practice . C CFig. 8. the images of negatives or prints of any reason-able size. A very simple arrangement of two mirrors at rightangles and a pair of drawing boards propped againstbooks will act as a stereoscope for viewing largerprints, such, for instance, as those given, and themethod employed is indicated in plan in fig. 8, whereA A are the prints, B B the mirrors, and C C theeyes of the observer. It will l)e obvious that theprints must be equidistant from the mirrors and 102 X-HAVS ) oxiutlv t»»osiU» to cufli oIIht, and tlionj^li thoorhitaland acioninKjdatinLT ninscltS (»f i\m eyes may l»rin»^lilt two viowH iiiin niiisnii when they are iniprojxrlyadjusttMl, tho Hlrain is JinconifmlaMc and jnohalilyinjuriniis, and tlu sienoscnpic <«llc<t is i< also of the iniporlancu to use (Mpially. Fig. 9. dark jjiinls ni (.M|ually dense negatives and lu illn-niinate tlieiii equally in tlie stereoscope. For satisfactory work a properly designed ai)})li-ance on the lines indicated by figs. 9 and 10 may easilybe constructed by the amateur. The wooden base-board in this example is about 36 in. long, andupright end-boards 10 in. sipiare are provided forthe i)rints, which are secured to them by drawing 1HA(JT1CAL \-IlAV \VOI{K o:{ pins. Those hoards slide loiiL^il ndiiiallv. aiid (Mic(see li^^ Id) also vertically. The ])Mii nf ininors is .iiraiiLCed on the t\v<t rij^ht-aiij^^le faces <►! a wnodeii imx shajicd like a ii;^r|it-aiiLjlod 4;) juisin iiKtiinled on a i(»d ahoiil which itcan he tinned stillly
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Keywords: ., bookcentury1900, bookdecade1900, bookidxrayssimplye, bookyear1904
