Mark. improved Microscope for Projection. New metal track platewith keysto unlockstandardand changeinstantly —combiningalso polari-scope andstamosenpe.New seriesof projec-tion objec-tives, with flat field, well lighted and clear definition. New sub-stage condenser on a new system. Illustrated…
Elevated · Feet · Tube · Machine · Plunger · Scientific American · Electrical engineering · Horse power · Feet wide · Mount washington · Foreign Countries · Shawmut avenue · Main valve · Glass bottle · Pleasant street · Fastening device
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