There are a number of different configurations of the Cabin Pressuizaiton control panel for the Lockheed L-1011. Most L-1011's had a combination instrument that would show cabin pressure and cabin altitude (similar to what you would find on the overhead of Boeing 737 panel). However, versions of the L-1011 had a discrete VSI, Pressure Differential and Cabin Altitude instrument .... very much like the Boeing 747. The pressurization panel that I have happens to be one that takes all 3 instruments. Today, we are going to look inside the fully analog CABIN VERTICAL SPEED Insrument.
Top View: The inside of the instrument is dominated by the large copper disk that flexes under different air pressure and controls the needle. Air will either enter the instrument at a fixed rate or leave it at a fixed rate ... hence, the differential will show the cabin climb or descent in thousands of feet per minute.
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