Search results
Results from the WOW.Com Content Network
On June 10, 1896, Cralle applied for a patent on his invention. He was awarded patent 576,395 on 2 February 1897. [4] The patented "Ice Cream Mold and Disher," was an ice cream scoop with a built-in scraper to allow for one-handed operation. [5] [6] Alfred's functional design is reflected in modern ice cream scoops. [7]
1936: Erwin Wilhelm Müller invents the field emission microscope. 1938: James Hillier builds another TEM. 1951: Erwin Wilhelm Müller invents the field ion microscope and is the first to see atoms. 1953: Frits Zernike, professor of theoretical physics, receives the Nobel Prize in Physics for his invention of the phase-contrast microscope.
Most ice cream scoops are hemispherical-shaped and contain a mechanical device to force the ice cream out of the scoop. The ice cream scoop was invented by African-American Alfred L. Cralle who was issued U.S. patent #576,395 on February 2, 1897. [58] 1897 Charcoal briquette
Antonie van Leeuwenhoek (1632–1723). The field of microscopy (optical microscopy) dates back to at least the 17th-century.Earlier microscopes, single lens magnifying glasses with limited magnification, date at least as far back as the wide spread use of lenses in eyeglasses in the 13th century [2] but more advanced compound microscopes first appeared in Europe around 1620 [3] [4] The ...
Cralle is a surname. Notable people with the surname include: Notable people with the surname include: Alfred L. Cralle (1866–1919), African-American businessman and inventor
Alfred L. Cralle, a porter in a drug store and at a hotel in Pittsburgh, Pennsylvania, [2] [3] noticed that servers at the hotel had trouble with ice cream sticking to serving spoons, and he developed an ice cream scoop. [4] On June 10, 1896, Cralle applied for a patent on his invention. He was awarded patent 576,395 on February 2, 1897. [5]
1931: The electron microscope is invented by Ernst Ruska. 1933: FM radio is patented by inventor Edwin H. Armstrong. 1933: Harry C. Jennings Sr. and his disabled friend Herbert Everest, both mechanical engineers, invented the first lightweight, steel, folding, portable wheelchair with their "X-brace" design. [468] [469]
The optical microscope, also referred to as a light microscope, is a type of microscope that commonly uses visible light and a system of lenses to generate magnified images of small objects. Optical microscopes are the oldest design of microscope and were possibly invented in their present compound form in the 17th century.