US MILITARY  WALLACE & TIERNAN JJ 16004 PORTABLE ALTIMETER USGS T-255450 (CIRCA 1940') ORIGINAL  US WW2 RARE FIND

This was a U.S. Army field Altimeter.

With hygrometer rare, show in pictures 5 and 6.

Housed in a cylindrical metal case, with hinged lid. The base contains the altimeter, which is simply an aneroid barometer. This is sealed behind a glass face to prevent moisture entering.

The lid has conversion scales "Air temperature and Relative humidity correction factors for Altitude", behind which clips in a hygrometer which is a Wet and Dry bulb thermometer style hygrometer.

 Operated by the atmospheric pressure bending the elastic top of a partially evacuated drum, actuating a pointer. The hygrometer can be removed from the lid and spun in the air so that a measure can be made of air temperature and relativity humidity ( which affects the density of the air). After both barometer and hygrometer measurements are taken, the tables are used to evaluate the approximate altitude.

 

Be sure to check out our other interesting items by clicking on "See other items".
Feel free to ask questions.




IMPORTANT INFO.

Our images form part of the descriptions.

Any issues on receipt please contact us immediately,
otherwise + feedback would be appreciated.

I will wrap your item as I would like items sent to me - SAFELY !!!
Items posted as soon as possible after payment received.
I will send you an "E-Bay" message after items have been posted.


International Buyers

Import Duties and Charged

We ship the item from Australia. Import duties, taxes, and charges are not included in the item price or shipping charges.
These charges are the buyer's responsibility. Please check with your country's customs office to determine what these additional costs will be prior to bidding or buying.

PLEASE ALLOW FOR TRANSIT DELAYS

With all that is happening around the World, social isolation and retail shop fronts closed, there is a lot of Online Shopping happening which means a HUGE amount of freight being moved around the transport network.
Interstate and International Borders closed, and limited flights, there are subsequent transit delays with both domestic and international shipments.⠀
⠀Please understand that this is completely out of our control, and our transport partners of Australia Post are doing their absolute best in keeping up with the mammoth volume of freight, and delivering you your goods as soon as they can.
When checking Shipping Tracking, you may notice less scans on your packages than usual, and slow movements - unfortunately at this time, this is expected. ⠀⠀
We thank you for your support & understanding
as we work through this tough time.
Stay safe 🙏