218 THE MACHINE-SHOP problem of attendance is linked. The practice of drilling single holes from a single-spindle machine is adopted less frequently than it used to be, and, instead, the practice of multiple drilling is resorted to where possible. In the Fig1- 54'—Three-way Horizontal Multi-spindle Machine majority of cases, jigs or fixtures, or both in combination, are now employed in drilling and reaming operations. Selected Machines.—Fig. 52 illustrates a stiff drilling machine by Baker Bros., Toledo, for boring motor cylinders. One motor firm has 350 " Baker " machines in its plant, many being arranged in gangs. The machine shown is electrically driven, being started, stopped, and reversed with a push button. In all the series the speed ranges are eight in number, and feed ranges twelve, the numbers being suited to the sizes of machines.