What common items are measured in lignes? (ligne = approximately 1/40 of an inch)
The tops of what common items are known by pan, button, dome, round, truss, flat, and oval?
Bobby T Plympton invented and manufactured what common item for men in the late 1800s?
Ferdinand Magellan kept 18 of these common items on his ship to track time.
What common item has the length of 0.250 inch, a leg thickness of 0.020 inch, a leg width of 0.030 inch, and a crown width of 0.500 inch?
What common item has the chemical formula C5 H5 NO2 ?
The plastic or metal end of this common item is called an aglet.