BAIRD &TATLOCK (LONDON) LTD. 



3676 



3676 s Seck's Laboratory Mill, for grinding substances to very fine powder, all parts easily 

 accessible, to work by power 



Dimensions. Revolutions Pulley Width 



Length. Width. Height. per minute. diameter. of pulley. 



15 in. n.8 in. 20.7 in. 300 7.87 in. 1.57 in. 



THE "SECK" LABORATORY MILL FOR FINE GRIST (FLOUR). 



The need of a carefully constructed fine grist (flour) mill has been felt for a long time. Hitherto it has not been 

 possible with mills of this category to produce material of the degree of fineness necessary for the determination 

 of the nitrogen percentage in barley and for other similar processes. In addition to this fundamental defect, none 

 of the mills hitherto used for this purpose were fitted with precision apparatus and scale, enabling correct regulation 

 of the degree of fineness. Again, the cleaning of the working parts of the mill was generally a very troublesome 

 and difficult performance. In a word, all fine flour laboratory mills now in use fail altogether to meet modern 

 laboratory requirements. 



To supply the demand for an up-to-date mill, a model has been evolved which will remedy all prior defects. 

 This mill has a cast-iron frame, which is divided into two parts. The lower half holds a fixed grinding-ring, 

 while the upper half hinges on to the lower and supports the vertical mill-roller, the precision regulating apparatus, 

 and the driving pulley shaft. Feeding is effected by means of a small hopper, which is closed down with a lid 

 during working. The milled produce is collected in a glass which, by means of a wedge closure, is pressed up 

 against an indiarubber ring surrounding the delivery opening. This arrangement prevents the loss of any flour 

 during grinding. The degree of fineness is regulated by turning a small hand-wheel connected with the vertical 

 roller. The latter is kept in position by means of a tightening screw with spanner movement. The upper part 

 of the hand-wheel is provided with a scale marked o to 50. The pointer is fixed on the frame. The grinding 

 rollers are fluted and similar in make to those of coffee mills, but differ from the latter in that the flutings are 

 of smaller dimensions at the bottom of the rollers than at the top. This device has the effect of gradually decreasing 

 the passage through which the produce passes, which therefore gets finer and finer as it passes from the top of 

 the roller to the bottom. The degree of fineness can be regulated so as to effect complete pulverisation, giving 

 a product for containing 98 per cent, of flour. The grinding rollers are of the best cast steel and extremely tough. 

 The wear and tear of the rollers will not be apparent until the mill has been in use for many years. Even 

 then, the scale can be readjusted, since the pointer affixed to the frame can be displaced so that the maximum 

 degree of fineness coincides with o. The hopper of the mill takes 100 grams (of barley). After use, the mill 

 can be easily cleaned by hinging back the upper part of the frame and removing all traces of powder with the 

 brush, which is provided with each mill. The flour brushed down falls into the glass receiver so that the produce 

 after milling weighs exactly the same as before. 



The mill has a horizontal driving shaft fitted with fast and loose pulleys. After grinding is finished the 

 belt can be pushed on to the loose pulley and the frame can be opened without removing the belt from the machine. 

 The careful construction and the ease and exactitude with which it works are the chief features of this mill. 

 The power required is nominal 



15 15 



CROSS STREET HATTON GARDE1ST, E-C 



696 





