"What are these weird cylindrical things? This on the top floor, deep inside one of many buildings of what used to be a naval engine research facility"
A: "These are carbon filter housings. HEPAs in large buildings like that are still squarish/rectangular. The perforated cylinders are common for carbon. Also, military buildings like that typically have carbon filters in addition to their HEPAs because they filter out toxic gases."
Holds fruits/ veggies to be sliced on a mandoline food slicer.
https://www.walmart.com/ip/WALFRONT-Mandoline-Slicer-Vegetable-Cutter-Chopper-Di
cer-Onion-Pro-Kitchen-Potato-Food-Cheese-Veggie-Cucumber-5-Interchangeable-Blade
s-Peeler/599823618
em_about_the_right_size_to/
ball(s) scratcher.