Photographic laboratory apparatus apparatus

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university, he continued his research in the same field and endeavored to find a way to transmit musical notes and articulate speech. in early , bell visited the famous scientist joseph henry who was then director of the smithsonian institution and asked henry's advice on an electrical multi-reed apparatus

gardiner hubbard who helped finance bell's work and organize the new telephone company. mabel was one of bell's deaf pupils. they had four children: elsie may bell ( ), marian hubbard bell (daisy) ( ), and two sons who died in infancy. in , bell received the volta prize which he used to fund the volta laboratory...

https://www.newworldencyclopedia.org/entry/Alexander_Graham_Bell

chemistry at harvard university . after his freshman year, he left harvard for new york city. in new york city , he invented the first inexpensive filters capable of polarizing light which he called polaroid film . he was not associated with an educational institution and lacked the tools of a proper laboratory

, making this a difficult endeavor, so he would sneak into a laboratory at columbia university late at night to use their equipment. [ ] he also availed himself of the new york public library to scour the scientific literature for prior work on polarizing substances. his breakthrough came when he realized...

https://en.wikipedia.org/wiki/Edwin_Land

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https://patents.justia.com/patents-by-us-classification/404

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