You're right - It does contain an accelerometer. This creates a quicker reaction to differential pressure than the conventional VSI. The accelerometer consists of a dashpot (pistons held in balance by springs) and is connected to the static capsule via a capillary tube. A change in vertical acceleration creates movement in the dashpot and thus alters the pressure in the capsule immediately creating pointer movement. As dashpot response decays the "actual" pressure change in the capsule becomes effective and the IVSI acts more conventionally.
I hope this answers your query.
BaltiKing
[This message has been edited by balti king (edited 16 December 2000).]
[This message has been edited by balti king (edited 16 December 2000).]