After obtaining his Master's degree Upton worked with Thomas Edison on mathematical problems associated with devices such as the incandescent lamp, the watt-hour meter and large dynamos.
Pagkatapos ng kanyang Master's degree Upton nagtrabaho sa Thomas Edison sa matematika mga problema na kaugnay sa aparato tulad ng maliwanag na maliwanag ang ilaw, ang wat-oras na metro at malaking dynamos.