[iLiNr]

Hi,

I'm on the verge of starting a science project requiring the use of an audus apparatus. However, I'm unsure of one piece of the design being the curved glass bit that intakes oxygen, which multiple videos have called "a microburette/funnel and capillary tube/capillary tube" as shown in the following video's timestamps:

https://youtu.be/awejsoKO17c 1:52

https://youtu.be/BsN6ySpViQU 1:18

I was wondering what that curved glass tube is or is made out of - I can't pinpoint it for the life of me. Or, if there are multiple methods, how does it generally work, so I can grasp a way to make my own.