THe MojonnigeR TEST 367 
14. Rheostat for fat plate. Lever must make good contact 
with one button, not with two at a time. When right button has been 
found that maintains constant temperature, mark this point on rheo- 
stat rim. When starting tester each day, turn handle on full until 
temperature has risen to within right point, then turn back to previ- 
ously marked button. 
15. Rheostat for fat oven. Observe same precautions as in 
(14). 
16. Rheostat for solids oven. Observe same precautions as 
in (14). 
17. Rheostat for solids plate. Observe same precautions as 
in (14). 
18. Handle for centrifuge. 
19. Snap switches for each hot plate showing temperature and 
time for treating samples at various points. 
20. Power unit, consisting of vacuum pump, water circulating 
pump and motor for same. Keep pump filled to air cock with oil 
furnished with tester. 
21. Automatic burettes and cans holding the water, ammonia, 
alcohol, ethyl ether and petroleum ether, placed in the order in which 
they are used. Each division on burettes delivers the proper amount 
of the desired reagent for a single extraction. 
22. Hood, to be placed over fat dishes when evaporating off 
ether. 
23. Legs, to be fastened to floor with lag screws. 
24. This side need not be fastened to floor. If necessary to 
take out power unit disconnect connections in rear of machine and 
move this part of machine forward. 
25. Chemical balance. Keep level, clean and handle carefully. 
Raise knife edges gradually and with care. Clean balance daily. 
Keep weights clean. When weights show signs of wear, order new 
ones. 
26. Cock, to exhaust vacuum from oven when cock (27) is 
closed. Must be kept closed when vacuum is turned on oven. 
27. Cock, that switches vacuum from main line into vacuum 
oven. Set of cocks at right is for solids oven, set of cocks at left 
is for fat oven. 
28. Hole in top of fat plate holder, communicating with suction 
