1. The tight contact prevents the separating member from moving upward in the water jacket.

2. Arachnoiditis is the clumping together and tethering of the descending nerves to the inner lining of the water jacket that contains the fluid that supports brain and the cord in the spinal canal

3. The most widely used Burettes are those employed in Orsat instruments (Figure 1).The Burette consists of a glass cylinder graduated upwards from 0 to 100 ml.The water jacket surrounding the Burette is generally sufficient to protect the Burette from temperature changes.