from The Century Dictionary.
- noun A box which counterbalances the load lifted by a balance-crane. It is usually a cast-iron box loaded with small weights or kentledge.
Sorry, no etymologies found.
Leave the apparatus in the balance-box for a few minutes and weigh.
A substance must always be cold when weighed, and large glass vessels should be allowed to stand in the balance-box a little while before being weighed.
It looked like the balance-box of a patent hay-scales.