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In 1889, the German company opened a subsidiary in Ponte Chiasso, Como.The Italian subsidiary was run by a German engineer, Ermanno Spindler.In the early years customers were small-sized non-specialist retailers, professional private users and businesses that employed Lechler products largely on iron and wood, e.g. coaches, railway wagons and carriages, tramway cars and furnishings.
Numerical aperture is commonly used in microscopy to describe the acceptance cone of an objective (and hence its light-gathering ability and resolution), and in fiber optics, in which it describes the range of angles within which light that is incident on the fiber will be transmitted along it.
Lorenz Lechler was a late 15th-century German master mason who composed Instructions, a booklet on gothic design, and who contributed to the Heidelberg Church. As a master mason, Lechler's writing gives insight into Gothic architecture from the perspective of a builder as opposed to the more common contemporary perspectives written by clerics.
Light cone coordinates can also be generalized to curved spacetime in general relativity. Sometimes calculations simplify using light cone coordinates. See Newman–Penrose formalism. Light cone coordinates are sometimes used to describe relativistic collisions, especially if the relative velocity is very close to the speed of light.
A Winston cone is a non-imaging light collector in the shape of an off-axis parabola of revolution [1] [2] with a reflective inner surface. It concentrates the light passing through a relatively large entrance aperture through a smaller exit aperture. [ 3 ]
There are cone trims which produce a low-brightness aperture. Multipliers are offered which are designed to control the omnidirectional light from "A" style incandescent light bulbs and compact fluorescents. Lens trim is designed to provide a diffused light and protect the lamp. Lensed trims are normally found in wet locations.