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2. EXTENSION ASMS FOR CARRYING MICROMANIPULATORS 



A pair of accurately slotted metal extension arms, capable of carrying the 

 manipulators may be attached to the base of the Chambers machine. These arms, 

 devised by Wright and McCoy, permit the manipulator to slide back from its 

 initial position, and return to precisely the same position. This sliding device 

 also facilitates the rapid exchange of micropipettes and other microapparatus. 

 A single arm, A, with its central slot, S, is shown in figure 10. A manipulator, 

 M, is in position, and by releasing the screw, Sc, may be moved back and forth. 

 The screw Scr fastens the arm firmly to the manipulator base. Vfright and McCoy, 

 1927. 



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