644 



WILLIAM HERBERT HOBBS 



including the important one of 1872/ By putting up a conductor 

 in the ascending current of steam he was able experimentally to show 



Fig. 6. — View of Vesuvius during the eruption of 1906 (earlier stages). Stage of April 5. 



Fig. 7. — View of Vesuvius during the eruption of 1906 (earlier stages). Later 

 than Fig. 6, probably on April 7. 



I Luigi Palmieri, Elettricila negV incendi vesiiviani, studiata dal 1885 /?«.' ora 

 con appositi instrumenti. Lo spettatore del Vesuvio e dei Campi Flegrei. (Naples, 

 1887; pp. 77-79.) 



