122 BEEHIVES AND BEE KEEPERS' APPLIANCES 



any honey which has already been extracted, in 

 the cylinder extractor as few parts as possible are 

 made to revolve, and this is a decided advantage. 

 The labour necessary to overcome the inertia of 

 a large mass of material in starting and stopping 

 is saved, and the decreasing weight of the comb, 

 which is perceptible when it and its connections 

 only are revolved, is an indication to the operator 

 that the honey has been extracted. 



For a given velocity, the nearer the comb is to 

 the centre of revolution the greater will be the 



Fi<r. 116. Cylinder Extractor 

 with. Frame Inside. 



Fig 1 . 115. Cylinder Honey 

 Extractor. 



centrifugal force, but the honey in most of the 

 cells will tend to press against their sides as well 

 as leave them. To overcome this tendency the 

 combs should be placed at an infinite distance 

 from the centre of revolution. It is evident that 

 practice more than theory is what will decide the 

 best position for the combs, and from exhaustive 

 experiments, Mr. Cowan has concluded that the 

 outer surface of the comb should, during extrac- 

 tion, be placed 6 in. from the centre of the spindle 

 round which it revolves. He has also decided that 

 extractors which hold two combs at the time are 

 preferable to those which hold four or more. 



