Question about real periscopes - Up and down mechanism

[Darkbluesky]

Hi,

Does somebody know if RL the uboats had a "rise periscope to the to the max" button/lever that automatically rises the periscope at its full? or they had to keep pushing a button/lever until the periscope stopped? And the same for lowering it?

I have not found any confirmation about that I a was wondering if someone here could know something about this.

Thank you