geologist, mechanical engineer, physicist, engineer, gemologist, electrical engineer, mineralogist, assayer, chemist, draftsman, aeronautical engineer, welder, crystallographer, boilermaker, geophysicist, scientist, petroleum geologist, metallurgical engineer, mathematician, chartered accountant, technologist, osteologist, electrician, horologist, sir humphry davy, machinist, microbiologist, numismatist, goldsmith, polisher, alfred binet, masc, millwright, fabricator, geomechanics, sovietologist, geneticist, microscopist, railwayman, bacteriologist, archaeologist, petrology, archeologist, violinmaker, biochemist, aerodynamicist, ufologist, mechanical engineering, electrical engineering, switchman, gemology, tribology, glenn t. seaborg, graphologist, oenologist, taxonomist, draftsperson, atomic energy commission, cartographer, metalsmith, palaeontologist, hydrometallurgy, philologist, troubleshooter, craftsman, indologist, gunsmith, mechanic, accountant, computational linguistics, surveyor, pharmacologist, silversmith, technician, inspector, pipefitting, educationalist, pipe fitter, engineman, typographer, theoretician, egyptologist, econometrician, mining geology, patternmaker, foreman, topographer, carpenter, beryllium, sinologist, armourer, tinkerer, cryptographer, polymath, henri becquerel, leo szilard, armorer, panofsky, engraver, astrophysicist, welding, coachbuilder, meteorologist, astronomer, navigator, botanist, architect, ethnologist, entomologist, musician, physiologist, pianist, statistician, designer, naturalist, organist

bessemer, sir henry bessemer

applied scientist, engineer, technologist

metallurgical engineer