Per US Census 1900 Thomas's occupation is listed as a glass blower.
"United States Census, 1880," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MZFY-MPR : accessed 20 Jul 2014), Thomas Cassidy in household of Patrick Cassidy, Corning, Steuben, New York, United States; citing sheet 137B, NARA microfilm publication T9.
"United States Census, 1900," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MSGD-JML : accessed 20 Jul 2014), Thomas Cassidy in household of Patrick Cassidy, Corning city Ward 4, Steuben, New York, United States; citing sheet 12B, family 256, NARA microfilm publication T623, FHL microfilm 1241163.
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