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Why do waiters carry a serving tray on one hand?

April 26, 2017carry hand tray waiters

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Why do waiters carry a serving tray on one hand?

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If the tray is being held in one hand, putting the palm on the underside of the tray and stretching the fingers in all directions for balance will keep the tray level and stable. Each finger should give stability to a different section of the tray.