The mechanics of the moon : dedicated to the astronomers and astrophysicists . bout 5 or 4 halfmoon couhl be divided into 12instead of 8 fields so that in the first casethe pictures would be 135X400 mm. in thelatter 170X500 mm. Two such picturesin easterly and westerly illumination mightbe placed side by side on one sheet, so that24 pictures a 2 cliches would be quite suf-ticient for the topographical purposes. Fortlie rays3\stem a single picture like that onthe title-page of the P i e r i n g atlas wouldbe quite sufficient. For such an atlas itwould be also valuable, if on the reve
The mechanics of the moon : dedicated to the astronomers and astrophysicists . bout 5 or 4 halfmoon couhl be divided into 12instead of 8 fields so that in the first casethe pictures would be 135X400 mm. in thelatter 170X500 mm. Two such picturesin easterly and westerly illumination mightbe placed side by side on one sheet, so that24 pictures a 2 cliches would be quite suf-ticient for the topographical purposes. Fortlie rays3\stem a single picture like that onthe title-page of the P i e r i n g atlas wouldbe quite sufficient. For such an atlas itwould be also valuable, if on the reverse ofeach plate the indicator for the next wouldbe printed so that the opened book wouldshow on the right side the picture and onthe left the indicatoi. The more it were 12 THE REQUIREMENTS OF THE SEL]i:NOLOGTST. possible to hinder the diffusion on the photo-graph, the more opportunity there woukl beof observing the moonstructures in the differentphases of ilhimination. The improvement ofbacked (lichthoffreier) plates seems to havemade great progress in the last few years,. Ordinary plateFIG. 1 therefore I show in Fig. 1 and 2 the good re-sult of a backed-plate against an ordinary plate is a product of Dr. c h 1 e u s s n e r e*c Co., Frankfurt a. M. and isknown in commerce under the name „Inalo. THE REQUIREMENTS OF THE SELENOLOPtIST. 13 There is no duul)!, that with such jihites,providing- the light and shadecontrasts aresufficient, hetter photographs of the mooncan be obtained, than those shown in theA and E pictures of the Pickering
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectcelestialmechanics
