# Help identify oscilloscope

If someone could identify the following it would be much appreciated. I am assuming it is an oscilloscope of some sort.

The device needs a lot of TLC; grounding the inputs leaves a small Lissajous like figure on the display, so all is not well.

If I could get a manual that would help, I do not have the nous to go in on my own :-(.

• It's of the U.S. Navy OS-8 oscilloscope series (1950s to '60s); IIRC they were made by multiple manufacturers, that should at least give you a start though. Edit: after a quick Google, here is the instruction book for the OS-8C/U and OS-8E/U, which appears to be similar if not identical. – uint128_t Sep 17 '17 at 1:33
• What's a "small Lissajous like figure"? – winny Sep 17 '17 at 8:32
• @winny: The glib answer is en.wikipedia.org/wiki/Lissajous_curve. If you drive the horizontal & vertical axes by $t \mapsto \sin (at), t \mapsto \sin (bt + \phi)$ where $a,b$ are rationally related you can get come cute curves. Practically, the Lissajous curve can be used to look at the phase difference between two signals of the same frequency. – copper.hat Sep 17 '17 at 10:34
• Oh! Learned something new today. – winny Sep 17 '17 at 10:53