368 THE MOJONNIER TEST 



P 



fan, on power unit. Run exhaust pipe on suction fan out of window 



and keep hood over the dishes in order to drive all ether fumes 

 from room. 



29. Stool, to be screwed to floor. 



DIRECTIONS FOR OPERATING MOJONNIER TEST. 



Preliminary directions for tests of both Fat and Solids. 



(1) Wash solids dishes with warm water and fat dishes 

 with gasoline. Dry with a towel and place into heated vacuum 

 oven for five minutes with vacuum on. At the end of five minutes 

 put these dishes into cooler and, with the pump still running, 

 keep them there for five minutes before weighing. Do not turn 

 off motor until last dish is weighed out of cooling chamber. 



(2) While dishes are being heated and cooled, wash 

 pipettes with water, alcohol and ether and dry by applying 

 vacuum at exhaust cock upon tester. Always use clean and 

 dry pipettes for each different sample. Aim to clean pipettes as 

 well as all glassw r are, immediately after using. 



(3) It is very important to keep extraction flasks clean. 

 Wash these with warm water immediately after extraction is 

 finished. Wash with washing powder and shot when necessary. 



(4)) After aluminium dishes have been in cooler for at 

 least five minutes, weigh accurately to .0001 gram, using the 

 proper counterpoise. Weigh solids dishes with cover on. Fat 

 dishes do. not have covers. Fat dishes should be cooled for 

 seven minutes before being weighed. 



(5) Use weighing pipettes as follows: Fill five-gram pipette 

 up to five-gram mark for butter fat, and one-gram pipette 

 up to one-gram mark for total solids. If duplicates are to be run 

 fill two pipettes from the same sample. As pipettes are filled 

 place lower end into cleaned and dry rubber tubes which are 

 pressed upon knobs at ends and center of weighing cross. Either 

 five or less samples for butter fat or five or less for total solids 

 may be pipetted out. 



(6) Weigh the cross with the pipettes containing the milk 

 on chemical balance accurately to .0001 gram. Run milk from 

 pipette into proper flask, or 3-inch dish if making solids test. 

 The pipettes may be distinguished by the number upon each 



