Assertion: plumb bob | /r/MadeOf | brass
Facets:
value: for the last two centuries
type: TEMPORAL
value: typically
type: DEGREE
value: with a steel tip
type: OTHER
Source sentences:
text: Plumb-bobs are made of heavy-duty materials, such as steel and brass, so the bob will last for years.
text: A plumb bob is made from steel, brass or lead.
text: For the last two centuries or so, plumb bobs have been typically made of brass or bronze with a steel tip.
text: A plumb bob is made from steel, brass or lead.