The Wm. Ainsworth & Sons Company of Denver Colorado, USA, produced highly accurate balances in the era before the arrival of digital balances. This Type BB unit which measures 46 cm wide by 25 cm deep by 50 cm high was used for many years for delicate chemical measurements at CRNL. It had a capacity of 200 grams per pan and a sensitivity of 1/20 of a milligram under full load.