WIECHEET SEISMOMETERS AT RIVERVIEW COLLEGE. 393 



ing stylus on the clockwork-driven drum carrying the 

 smoked paper. 



The seismograph last described, is of special interest 

 from the fact of its being, so far as I am aware, the 

 only Vertical Seismograph in Australasia actually in 

 use. One reads and hears from time to time somewhat 

 disparaging criticisms as to the performances of vertical 

 seismographs, and certainly with the older models so much 

 was left to be desired as quite to justify such criticisms. 

 But without over-praise of the Wiechert Vertical Seismo- 

 meter, I think that its records will before long do much 

 here in Australia, as they have done in Europe, to alter 

 the unfavourable opinion regarding this class of instrument, 

 and make it to be considered as an important auxiliary to 

 its more favoured companion and fellow- worker in a well- 

 equipped geophysical observatory — the Horizontal Seismo- 

 graph. 



