This is an example based on the Lister frame, made by Powell & Lealand and retailed by Carpenter. It is known as the \\\”Student\\\” or \\\”Iron\\\” as the stem and frame are made of black iron. Although most of these examples only have coarse focusing, this one also has fine focusing. The focusing screw activates a pinion which acts on a rack which is built inside the body tube itself. Ross and, especially, Dancer, used the same focusing system
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