Nathaniel Dominy IV and Felix Dominy used the Pendulum Spring tool quite frequently in the clock shop; their accounts indicate that they often had to replace the springs of watches they repaired, and this tool would have been essential. That this tool was much used by the Dominys is evident from the frequent repairs to its handles. The present brass handles are replacements, probably made by Felix Dominy sometime after 1817 when he began to work in the clock shop.
Pendulum spring blueing tool, probably England, Nathaniel Dominy IV (purchaser, user), 1817-1835. Iron; Brass. 7.8" (L). Mark: "T" incised. Museum purchase, from Nathaniel M. Dominy, 1957.0084.066