It is similar to a sextant, in that the device is using mirrors to measure an angle between two objects but differs in that one dials in the height of the object.The stadimeter was invented in 1894 by Bradley Allen Fiske, a Rear-Admiral in the United States Navy.
1894 Mousetrap A mousetrap is a specialized type of animal trap designed primarily to catch mice. Mousetraps are usually set in an indoor location where there is a suspected infestation of rodents. Hooker of Abingdon, Illinois, exactly three years before James Henry Atkinson developed a prototype called the "Little Nipper".
Atkinson probably saw the Hooker trap in shops or in advertisements, and copyied it as the basis for his own model.
Patents were issued to Judson for the zipper in 1891, 1894, and 1905.
1893 Spectroheliograph The spectroheliograph is an instrument used in astronomy that captures a photographic image of the Sun at a single wavelength of light, a monochromatic image.
The interior end takes a variety of forms depending on its application.