BAIRD &TATLOCK. (LOM)ON) LTD. 



SECTION No. 9. 



Apparatus for Milk Analysis, and Centrifugal 

 Machines for the Estimation of Butter Fat, &c. 



Machines. 



each, 1/3 



4871-4874 4875 



Leffmann-Beam Centrifugal Machines for estimation of butter fat in milk, etc., as 

 described in Analyst, 1892, vol. xvii., pp. 83, 102, 144. 



Prices with bottles and pipettes, but without acid 

 2 bottle machine 

 4 



6 



12 



Accessories for Leffmann-Beam 

 Bottles with graduated neck 

 Tubes, plain 

 Pipettes, with mark 3 cubic centimetres . . . . . . each, 4d. 



,,9 ,, 5d. 



15 . ,. 7d. 



Automatic pipette, 3 cubic centimetres, with Friedrich's patent stopcock, as figured No. 

 3184 . . 



Automatic pipette, 9 cubic centimetres with Friedrich's patent stopcock 



Hydrochloric acid, pure 1.16 



Sulphuric acid, commercial 1.835 sp.gr... 



Fusel oil, specially purified for milk analysis 



DIRECTIONS FOR USING MACHINES Nos. 4871-4874. 



15 cubic centimetres of milk are put into the bottle, 3 cubic centimetres of a mixture consisting of equal 

 ts of fusel oil and strong hydrochloric acid are added, mixed, and 9 cubic centimetres of strong sulphuric 

 i of 93 per cent., or specific gravity 1.835, poured in slowly with agitation. The liquid becomes hot and the 

 ein is completely dissolved, a dark reddish-brown solution being formed. The neck is filled to near the zero 

 nt with a hot mixture of sulphuric acid i part, and water 2 parts, and the bottle whirled in the centrifugal 

 chine for from one to two minutes. Milk very poor in fat may require from three to four minutes. The volume 

 at which rises in the neck can be read off directly. If but one test is to be made, it will be necessary, of course, 

 irder to preserve the balance of the arms of the machine, either to make duplicate mixtures, or to fill the other 

 t bottles with diluted sulphuric acid. 



71 



72 

 73 

 74 



75 

 76 

 77 

 78 

 79 

 80 



81 

 82 

 83 

 84 



250 

 330 

 400 

 5 10 



1CHEMICAL AND SCIENTIFIC APPARATUS AND PURE CHEMICALS. 



887 



