BAIRD &TATLOCK (LOM)ON)LTD. 



rasiaiti 



Motor with starter, for driving Centrifuges 899 and 902. 



SPECIFICATION OF MACHINES (Nos. 899 and 902). 



The machines are constructed to carry eight nickel-plated metal buckets spun from sheet brass, 

 and fitted with steel collars having horizontal axis. The buckets hang vertical when at rest. 



Each bucket is fitted with heavy glass vessel capable of holding too cubic centimetres or 200 cubic centi- 

 metres. The revolving head is fitted with a spun copper guard to reduce air resistance ; this copper guard 

 lias a movable cover to allow easy access to buckets. The revolving head is mounted on a vertical steel driving 

 shaft which is furnished with four sets of ball bearings ; two sets of ball bearings carry the load of machine, 

 anil the other two sets prevent side movement. 



The lower part of steel revolving shaft carries the driving pulley, and the extreme end is mounted on a 

 footstep, ball bearings. 



I lie friction is thus reduced to a minimum, and the machine can be run at a speed of 3,500 revolutions 

 per minute for two or three hours without any of the bearings becoming unduly warm. The load is taken at 

 rijjht angles to the axis of rotation of the balls, and a perfect rolling action is the result. 



The entire machine is mounted on a solid cast-iron base with dome-shaped upright. Machine should be 

 fixed on an absolute steady base and bolted in position. A concrete bed in which the holding plates and bolts 

 are fixed is preferable. By this means the machine may be run at full speed without setting up any speed 

 vibration. 



Each machine before being sent out is t"sted fully loaded at a speed of 4,000 revolutions per minute for 

 several hours, but machine in use should not exceed 3,500 revolutions per minute, otherwise the glass vessels 

 are liable to be crushed. 



