patented on december . [ ] the portable harmonium is another of his inventions, which gained a prize medal at the great exhibition of . he also improved the speaking machine of de kempelen , and endorsed the opinion of sir david brewster , that before the end of this century a singing and talking apparatus...
four probe set up diode clipping circuit adiabatic expansion planck's constant apparatus analogue trainer dielectric constant kit spectrometers quartz/calcite/glass/hollow prism microscope millikan's oil drop experiment viscosity apparatus. thermo e m f apparatus interferometer for measurements on ultrasonic...
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