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chemistry hood project - welding finished - fixing a work-stool for Nikolaus

198: chemistry hood project -
197: Broken indicator lot - better shape than I thought - several just need a new crystal. I will bet that more than half are fixable.
196: chemistry hood project - rings ready to weld.
195: Truing up a DOM pipe for the chemistry hood project.
194: You can see the calibration network inside the 5-pin 240° shell
193: Federal 230's all restored and working. Had to steal a zeroing pot from one of the old ones.
192: Tim saw an old Microchroma computer at a museum - same as my first computer..
191: Used my Russian 1um blocks to test the Federal 230
190: Soldered a brass 3mm nut to replace the broken off tab.
189: Federal 230 - There is supposed to be a post sticking up in the center of this picture - opposite the tab pointing down - limits the travel of the switch - someone forced it and broke it off.