First egg beaters, that appeared in 1859, look a lot like today egg mixers. The first egg beater with a screw clamp was invented by James F. Monroe of Fitchburg, MA and Edward Pear Monroe in New York.
Who used these manual mixers?
The 1856 patented model was first used in hotels and restaurants. It became very popular in professional kitchens and laboratories together with its improved versions. Nevertheless, families began to use manual mixers as well. It was the perfection solution to speed up the “laborious and tiring operation” of whipping egg whites.