Pressure Altitude Calculator for Rolls Royce Dart 534-2 Engine (NOS)

Description

Pressure Altitude Calculator for Rolls Royce Dart 534-2 Engine (NOS)
Pressure Altitude Calculator for Rolls Royce Dart 534-2 Engine (NOS)
This is an interesting little gizmo.  It is labeled as an "indicator" for use with the Rolls Royce Dart 534-2 Turboprop engine in 1971, but it is clearly a type of calculator used to determine the pressure altitude.  We are assuming it is used by setting the dial at the fuel level on the bottom scale and noting the prevailing air temperature given by the control tower on the upper outer scale, the pressure altitude is read on the upper inner scale.
The Dart engine was primarily used in civilian/commercial transports such as the Vickers Viscount in the 1950-70's.
Knowledgeable visitors are invited to either correct or confirm this information.
Measures ~ 3 in square.
Please note that seller does not represent that this specific artifact was actually removed from any aircraft or vehicle if cited in the description, but that any documentation referenced here is evidence that it is the same type number and/or manufacturer's part number used in these aircraft or vehicle, or if such numbers are not available, the artifact closely resembles illustrations from documentation or other reference sources. We do our best to link artifacts to specific aircraft or vehicle, but Buyer accepts responsibility to perform the research to verify the artifact's use in specific aircraft or vehicle.
2BAnAviator is presenting military aircraft, and other, artifacts from the 1940's, 50's, 60's, and 70's, ready for casual or serious collectors interested in aviation history. Our inventory includes artifacts from aircraft of the US Navy, US Army Air Corps (i.e., pre March 1942), US Army Air Force (March 1942 to Sept 1947) and the US Air Force (post Sept 1947), as well as from those of allies and adversaries from the era. Watch 2BAnAviator for many more listings coming soon.
Note that items are sold for collectors or restorers. Unless otherwise specified, seller makes no representation of the item’s serviceability or fitness for use in an aircraft other than for static display.
Will ship once payment is processed. Please note that ex-US shipments have a handling fee due to the additional documentation required. Payment within 2 days of winning bid is appreciated. Thanks for looking!