BAIRD &. TATLOCK (LONDON) LTD. 



884-886 



Martin's Water-Driven Centrifuge, designed by Dr. C. J. Martin, Director of the Lister 

 Institute of Preventive Medicine. 



This Centrifuge consists of a plate with four radiating chambers (see illustration above), each having a 

 depth sufficient to take a tube and its necessary holder flush with the under surface of the plate, thus avoiding 

 all atmospheric resistance. The plate is fitted to a spindle, pivoted between an upper and lower centre, and 

 the spindle carries at its lower end a small water-wheel in a " well " to which are attached the nozzle or 

 nozzles and fittings for connecting with the water main and for carrying off the waste water. The upper 

 centre is poised lightly to avoid friction, and is mounted in a flexible holder, thus giving the necessary 

 freedom from strain when working at high speeds. Throe plates are provided, carrying tubes of 25 c.c.. 10 

 c.c., and 5 c.c. capacity respectively ; when only a low pressure is available the smallest plate will probubly 

 be the more suitable. The speed has been carefully measured, and a rotation of from 2,000 to 6,500 per 

 minute can be maintained with, ordinary pressure and with absolute safety. 



DIRECTIONS FOR FIXING, AND FOR THE USE OF CENTRIFUGE. 



1. See that the table or bench to which it is to be fixed is carefully levelled. 



2. When the "well" is screwed down and before the cover is replaced, the point of the jet must be 

 adjusted to within about J inch of the motor wheel, and fixed in position by the counter nut ; then connect 

 with the supply and see that there is no obstruction. 



3. Replace the well cover and plate carrying the tube holders ; then bring the upper centre into position, 

 taking care that it is so lightly poised over the spindle that practically there is no friction during rotation, 



4. LUBRICATION. It is absolutely essential to the perfect working of the Centrifuge that the centres should 

 be daily and regularly lubricated before use ; also that the oil tube and gravity cup should be kept well supplied 

 while in constant use. The heavy petroleum oils as used for gas engines are the most suitable. 



5. The plate, when working, must always be equally balanced, i.e., the tubes must lie used in pairs and 

 not singly. 



6. In attaching the waste pipe take care that it is never less in diameter than the outlet i inch iron 

 barrel for the single jet and li inch for the double jet. 



7. In the case of a Double Jet Apparatus with high pressure, it is of advantage to fit a stop-tap so that 

 one of the jets can be cut off when the small size plates are in use. 



Machines with single jet for high pressures. 

 884' With 5 c.c. brass plate, four tube holders and twelve glass tubes 



885 T Witli 10 c.c. brass plate, four tube holders and twelve glass tubes 



886 T With both 5 and 10 c.c. brass plates, eight tube holders and twenty-four glass tubes 



each 



550 

 560 

 6 16 



14 CROSS STREET HATTOTST GARDEN, E-C 



