This peper is the first report of my practical investigations on the grab, and contains, I. Introduction of two novel driving mechanisms of the grab of my original design, with describes of various kinds of exsisting ones, II. Investigations on the counter weight of the grab including my system, III. Investigations on the time required for one cyclic operation of the grab, and an empirical formula based on my experimental data : [chemical formula] where t, time required for one cyclic operation of grab in sec., T_t, time required for opening and closing of grab in sec., v, speed of rope of grab in m./min., S, total moving distance of grab in m., m, number of changes of direction of motion of grab., t', time required for breaking in sec., t_h, time required for one handling in sec., n', number of handlings., F_t, time in sec. required for miscellaneous operations not included in preceeding items.
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