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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.'

microcharacter

CONTROLS AND LEVELS FOR THE MICROCHARACTER:

  1. Knob controlling rapid horizontal movement of slide
  2. Knob controlling vertical movement of slide
  3. Crank controlling slow horizontal movement of slide
  4. Lever for engaging or disengaging slow motion control
  5. Knob to lock slide holder position
  6. Knob to lock slide holder position
  7. Knob to open sprung slide holder arm
  8. Main spirit level
  9. Knob for adjusting lateral movement of crossbar of bracket holding cutting edge to keep it parallel to movement of slide
  10. Knob for adjusting movement of crossbar of bracket holding cutting edge to keep it parallel to movement of slide
  11. knob for raising or lowering T-bar carrying cutting edge
  12. Spirit level on arm for cutting edge