(c) TIME STUDY FOR ALL OPERATIONS DONE BY THE VARIOUS MACHINES.

This information is best obtained from slide rules, one of which is made
for each machine tool or class of machine tools throughout the works;
one, for instance, for small lathes of the same type, one for planers of
same type, etc. These slide rules show the best way to machine each
piece and enable detailed directions to be given the workman as to how
many cuts to take, where to start each cut, both for roughing out work
and finishing it, the depth of the cut, the best feed and speed, and the
exact time required to do each operation.

The information obtained through function (b), together with that
obtained through (c) afford the basis for fixing the proper piece rate,
differential rate or the bonus to be paid, according to the system
employed.

(d) THE BALANCE OF ALL MATERIALS, RAW MATERIALS, STORES AND FINISHED
PARTS, AND THE NUMBER OF DAYS' WORK AHEAD FOR EACH CLASS OF MACHINES AND
WORKMEN.

Returns showing all receipts, as well as the issue of all raw materials,
stores, partly finished work, and completed parts and machines, repair
parts, etc., daily pass through the balance clerk, and each item of
which there have been issues or receipts, or which has been appropriated
to the use of a machine about to be manufactured, is daily balanced.
Thus the balance clerk can see that the required stocks of materials are
kept on hand by notifying at once the purchasing agent or other proper
party when the amount on hand falls below the prescribed figure. The
balance clerk should also keep a complete running balance of the hours