Retarders definitions

retarders

Slow drying solvents used for reducing the drying rate of an ink.
Found on http://www.encyclo.co.uk/local/21179

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Retarders

These are rail-based brakes used to stop or hold wagons without the use of the wagon's or a train's own brakes.
Found on http://www.railbrit.co.uk/Glossary.htm

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