They built another experimental furnace nearby but mechanical deficiencies led them to abandon the furnace at the end of 1839 .
Nearby was worked for about two months during fall and winter 1838 and for some time in 1839 .
They built another experimental furnace nearby , which was worked for about two months during fall and winter 1838 and for some time in 1839 , but mechanical deficiencies led them to abandon the furnace at the end of 1839 .