74 



NEW YORK STATE MUSEUM 



for the year 1906. Beginning with 1909 the demand began to im- 

 prove and steadily increased, due to a greater activity in building 

 operations and to a better recognition of the value of sand-lime brick 

 in construction. Methods of manufacture changed and the product 

 now is a strictly high grade sand-lime brick having a calcium silicate 

 bond. The industry of the State is concerned only with this grade 

 of brick, there being at present no commercial production of mortar 

 brick. 



The majority of the operating plants in the State manufacture 

 their product with the standard American dry press, though the Ger- 

 man rotating press is represented. The crude material in all cases 

 comes from local sources and the finished product supplies generally 

 only the local demand. The following table shows the progress of 

 the industry in the State. The figures for 1903, 1904 and 1905 were 

 not obtainable. 



Production of sand-lime brick 



QUANTITY 



VALUE 



PER 



THOUSAND 



OPERAT- 

 ING 

 PLANTS 



I906 

 1907 

 1908 

 1909 

 I9IO 

 I9II 

 1912 

 I9I3 



17 080 OOO 



16 610 OOO 



8 239 000 



12 683 OOO 



14 053 OOO 



15 178 OOO 



21 23I OOO 



22 225 OOO 



$122 34O 

 109 677 



55 688 



81 693 



82 619 

 92 064 



133 736 

 143 345 



16 

 60 



44 

 3i 



88 



05 

 30 

 40 



STONE 

 The products of the quarries form a large item in the total min- 

 eral production of the State. The last few years have witnessed, 

 however, some notable changes in the relative importance of the dif- 

 ferent branches of the stone industry. The use of cement and terra 

 cotta has curtailed the demand for cut stone in building operations, 

 so that this branch no longer occupies the prominent place that it 

 once had. Similarly, the market for flagstone and curbstone has 

 fallen off, more especially for flagstone, as a result of the favor 

 shown for cement construction. On the other hand there has been 

 a tremendous development of the crushed stone industry, which has 

 practically counterbalanced the declines in the other departments. 



