HARDNESS TESTER FOR USE WITH MICROSCOPE
MAKER: SPENCER
c. 1945
DATES of PRODUCTION: 1920's to 1950's(?)
SIGNED:'MICROCHARACTER, American Optical Co, Buffalo 15, N.Y., Made in U.S.A.'
CONTROLS AND LEVELS FOR THE MICROCHARACTER:
- Knob controlling rapid horizontal movement of slide
- Knob controlling vertical movement of slide
- Crank controlling slow horizontal movement of slide
- Lever for engaging or disengaging slow motion control
- Knob to lock slide holder position
- Knob to lock slide holder position
- Knob to open sprung slide holder arm
- Main spirit level
- Knob for adjusting lateral movement of crossbar of bracket holding cutting edge to keep it parallel to movement of slide
- Knob for adjusting movement of crossbar of bracket holding cutting edge to keep it parallel to movement of slide
- knob for raising or lowering T-bar carrying cutting edge
- Spirit level on arm for cutting edge