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November 254 Telescope Loading the SeIf-unloader BEN E. TATE Telescope November 255 Riders of the Bob-Lo boats often have a chance to see how self-unloading freighters deposit their cargoes of coal, limestone and the like upon the shore. These photographs show how crushed rock gets into the freighter in the first place, and were taken on an expedition with Institute members Dave Glick, Jack Goodrich and Jim Dziak to Marblehead, Ohio. Oppoiitf page--top: A tractor shoves crushed rock toward the conveyor system that will take it out on the dock to the waiting freighter BEN E. TATE of the Columbia Transportation Co. Bottom: A view of the TATE's self-unloading boom. This page--left: A conveyor brings crushed stone aboard the TATE, Top right* Marblehead stone quarry, a few miles inland from the dock. Bottom* Marblehead Lighthouse, built in 1821, is the second oldest (after Buffalo) on the Great Lakes system.