16 BULLETIN 1100, U. S. DEPARTMENT OF AGRICULTURE. 
The laboratory is equipped to handle only 20 samples at a time. 
Consequently it is important that the runs be arranged in such way 
that they do not conflict in the use of the apparatus, and that all runs 
will be handled in the same way as nearly as possible. Therefore, in 
order to obtain uniformity of treatment and the largest possible 
weekly output, the following schedule has been worked out. It is so 
Fig. 5.— Washing apparatus. The empty washing baskets are shown in the first tub and the washing 
baskets filled with wool in the second tub. When this apparatus is in operation the washing baskets 
rise, move from end to end, and fall. Note the holes in the partition between the first and second tubs. 
Water is allowed to rise almost to these holes and is then shut off. In case of an overflow the holes pre- 
vent flooding the top. The water is heated by steam pipes in the bottom of each tub. At the right of 
A is the electric switch button and the motor, B, that drives the washing machinery. The ordinary 
clothes wringer shown in the foreground is used for wringing water from washed, rinsed wool samples. 
The air pipe, C, conducts air into tank, D, of the blower-dryer. The heated air returns through the 
upper part of the blower-dryer, where the baskets of wool are placed for drying, and the air passes out 
of the dryer through the pipe shown at E. 
arranged that it operates in weekly cycles (the work of each day of 
the week being the same as that of the preceding week). This 
schedule also has the advantage of rendering possible the picking up 
of the threads of the process, without delay, in case of change in 
individual operators in the laboratory. 
The different steps outlined below are explained in detail on 
pages 2, 3, and 4. 
