pass to the bifilar, andthe third to objects,~the inventive genius of the fourth dynasty exactly the balance. anticipated modern devices by adopting tubular drills vary- The system as 2 whole is so arranged that the luminous ing from #%, of an inch in diameter and 73, of an inch in images of the… … of each of these elements, and used in a variety of ways, thethree others so many curves wellstudied out by Mr. Petrie. which gives their variations. The distance from one curve Rock excavation, both for saving the stone and for the crea- ployed in those few observatories in which the study of ter-…
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