Simms Spectroscope, 1830

In 1830, Simms, an optician, made an improvement in the construction of the spectroscope by placing a lens in front of the prism, so arranged that the slit was in the focus of the lens. This lens turns the light after it has passed through the slit into a cylindrical beam before it enters the prism. Another lens was also introduced by him which receives the circular beam emerging from the prism and compels it to throw an image of the slit, which may be magnified at pleasure for each ray. The lens between the prism and the slit is called the collimating lens

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