What you are trying to reinstate is along these lines:further investigation finds that the 2 securing release pillars for the galvo are actually terminals, connected to both the galvo and the internal resistor banks. tomorrow will try and see if connecting 2 PP3s will get some life into it. if i read it right, maybe someone has modded it to use PP3s instead of the original battery, necessitating the removal of the meter to replace said batteries. weird.
Hopefully that will set your bearings. (EDIT The middle button should say G and the bottom button should say B, sorry)
For testing purposes you could swap out the Galvanometer with a digital multimeter.
Here it is working....observe that with the DECADE set to 678 ohms, and a resistance of 678 ohms between X1 and X2 we get 0v in the middle:
For academic interest only, see this old thread of mine - it's exactly the same concept but yours is ready to roll, wheras a post office box needs a power source and a galvonometer/voltmeter connecting up.
Post Office Box experiment | on ElectriciansForums
Find Post Office Box experiment Advice and Help. How-to Post Office Box experiment in the Electrical Engineering Chat advice boards on ElectriciansForums.net | Free Electrical Advice - Electricians Forums: Electricians' Talk Forums. Post Office Box experiment on ElectriciansForums.net...
www.electriciansforums.net
Last edited: