CORRECTIONS TO HYDROMETER READING
1. For ydrometer the appropriate corrections should be applied.
2. For most Draft Survey purposes, no further corrections to the readings are needed.
Reading is most correct when the glass hydrometer is used at a temperature of 15°C. If immersed in water at temperatures higher or lower than 15°C, the instrument will expand or contract so that, for precise laboratory work, a small correction would be applicable However, for Draft Survey work, it should be noted that the ship itself will normally expand or contract according to the temperature of the water in which it is rating. The corrections required to compensate for these changes in volume are of opposite signs and tend to compensate for each other. As it is not practicable to calculate any temperature corrections for the ship, for most Draft Survey purposes no correction should be applied for the expansion or contraction of the hydrometer glass

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