﻿REPORT OF THE DIRECTOR I9IO 21 



nent place among the mining regions of the country. There has 

 been practically no production for the last twenty years ; but with the 

 recent improvements in the conditions surrounding the iron indus- 

 try of the East, a revival of mining in this section seems not unlikely. 

 No detailed study of the geology and ore occurrences is available at 

 present; the literature is limited to the brief reports by Putnam 

 and Smock which are mainly descriptive of the individual mining 

 operations as conducted at the time of their visits (more than twenty 

 years ago) and to one or two brief articles since contributed to the 

 scientific press. 



Recent exploratory work in the Adirondack's has added to our 

 knowledge of the magnetic ores. of that region, in particular those 

 of Mineville and the vicinity of Arnold Hill. In the latter district 

 some apparently extensive bodies of magnetite that had escaped the 

 attention of mining companies formerly active there, have been 

 uncovered. The explorations are to be continued until the import- 

 ance of the deposits may be accurately measured. 



SEISMOLOGICAL STATION 



The Bosch-Omori pendulums which are installed in the basement 

 of the .State Museum have been maintained in good working order 

 throughout the year. Such interruptions as occurred were neces- 

 sary to the proper care of the instruments. In their present sur- 

 roundings where the air becomes very moist during the summer 

 months they are very liable to injury from rust and consequently 

 require frequent attention. 



The equipment has been improved by the addition of a large clock 

 which is regulated ever)' hour by standard time received over the 

 Western Union wire. Hitherto the connection of the instrumental 

 time clock could be made only by indirect comparison with the local 

 service so that there was always an element of error in the records, 

 amounting perhaps to as much as a minute. With the present 

 arrangement the error can not exceed a few seconds at most, which 

 is well within the limits of accuracy for registration in machines of 

 this design. 



The number of earthquakes recorded at Albany for the year end- 

 ing September 30, 1910, was 23, as compared with 19 in the pre- 

 ceding year. A total of yy disturbances, has been observed since 

 the instruments were installed in March 1906. Despite the fact 

 that the records indicated a relatively high frequency for the year, 

 in excess of that hitherto noted at this station, there were very few 

 macroseisms and only a small number which afforded well-defined 



