o the balance. objects,^the i.nventive genius of the fourth dynasty exactly anticipated modern devices by adopting tubular drills vary- The system as a whole is so arranged that the luminous ing from ffo of an inch in diameter and yf^ of an inch in images of the slits, after being reflected from… … Fig. l.-INSTRUMENTS FOR REGISTERING TERRESTRIAL MAGNETIC VARIATIONS. of each of these elements, and used in a variety of ways, the three others so many curyes well studied out by Mr. Petrie. which gives their variations. The distance from one curve Rock excavation, both for saving the stone and for…
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