Tuesday, May 26 2020, 05:56 am
The problem of the obelisks, from a study of the …

The problem of the obelisks, from a study of the …

8 PREFACE theresultsofmyexperimentswiththescale modelshowninfigs.27-33,whichMr.Donaldson, oftheEgyptianStateRailways,kindlymadeto mydesign.Nophotographsofthismodel …