rider(redirected from Riderless)
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1. an additional clause, amendment, or stipulation added to a legal or other document, esp (in Britain) a legislative bill at its third reading
2. Brit a statement made by a jury in addition to its verdict, such as a recommendation for mercy
3. a small weight that can be slid along one arm of a chemical balance to make fine adjustments during weighing
4. Geology a thin seam, esp of coal or mineral ore, overlying a thicker seam
a wire weight of several milligrams, used for precise weighing on an analytical balance. By moving the rider along the balance beam, it is possible to vary the load from fractions of a milligram to 10 mg.
A piece of type that is raised higher than surrounding type, and tends to make a heavier impression on the paper.
A steel or iron crossbeam which slides between the guides in a sinking shaft; it is carried by the hoppit and serves to guide and steady the hoppit during its movement up and down the shaft.