Trii unit ion t^udlfH 



45 



to reduce the scales in two directions at rij,'ht anglt?8 in any desired and 

 different ratios? A photo^aph, or with tnore lalnnir a pantaj;ntph, will re- 

 duce in />(>//( directions in the smiie ratio, hut this is not what is ncedtnl. 

 A contrihutor of a memoir rarely pays any attention to the pro|>oi'tions of 

 the page in which he desires his pa|>er to appear, and then it is a mere chance 

 whether his diaj^rams however neatly constructeil can be used without re- 

 drauirjitijiif. The ideal remedy wouldbe a photographic process of bi-directional 









%,rt-r »"y »«i'" «.•/■• 



h ItLkLt^ l^y^h 



One of Oalton's oriRinal deeiKOB for double pantagrapli, coloured in the actnal drawing. 



leduction, because photographv is so much shorter and cheaper than panta- 

 graj)hic work. The difficulties as to distortion of k-ttering would be over- 

 come by pasting on the printed lettering to the reduced photograph, instead 

 of to the original drawing. But although this topic more than ouee formed 

 the sxibject of long talks of the present writer with Francis Galton, no 



