A professional who tends battery of condenser tubes in which gaseous mercury is condensed into liquid mercury. Respnsibilities include:

• Places water-filled buckets at base of each tube to collect liquid mercury.
• Removes buckets as mercury accumulates, pours off water, and strains mercury into steel flask.
• Pours mixture of water, mercury, and dust onto sloping table, adds quicklime, and stirs mixture with hoe to separate remaining mercury from sediment.