UEEBER METHOD. 



233 



-H ! 



Steam turbines, water turbines, and electro-motors (Fig. 26) 

 are also largely used as the motive power, especially witt large 

 machines. 



Apparatus, etc. — 1. The acido-butyrometer is a glass vessel 

 closed by an india-rubber 

 cork, and with a graduated 

 neck divided into ninety 

 divisions; one division = O'l 

 per cent. fat. Every tenth 

 division is longer than the 

 others, and the intermediate 

 fifth divisions are also 

 slightly lengthened to facili- 

 tate reading. 



The neck may be either 

 round, as in Gerber's original 

 butyrometers, square section 

 [or extra strength, and flat 

 for ease in reading (Figs. 27 

 and 28). 



A special acido-butyro- 

 meter is made for skim 

 milk ; the upper portion o( 

 the neck is narrowed, and 

 bhe divisions are much wider. 



2. The acido-butyrometer 

 Eor cheese, etc., is open at 

 both ends, and the lower 

 jork carries a small glass cup. 



3. The author's butyro- 

 iiu'tcr stand consists of a 

 metal plate pierced with 4, 

 i, or 24 holes, and an india- 

 ■ubber plate with 4, 8, or 24 

 ;orresponding holes so cut 

 ;hat the butyrometers are 

 did easily in and out and yet 

 ire retained when inserted. 



4. 11 c.c. pipettes for milk 

 vith, or without, automatic 

 neasurement. 



4a. 3 c.c. pipettes for 

 ream. 



5. 1 c.c. pipette for amyl alcohol. 



6. A wat«r pipette, 10 c.c. in ,\j c.c. 

 6n. A water pipette for cream, delivering 8'2 c.c. 



Figs. 27 and 28.— Gerber Bottles. 



