![]() Obviously, a darker room will allow easier viewing of fainter spectrums. The distances to the ground glass can be increased for larger images, but with subsequent decreases of image intensity. The distances shown in the illustrations work well. And since the bulb’s filament will be four or five inches above the bench top, some large books or other flat objects can be stacked so the vertical center of the optical components match the center height of the slit. It is important that the heights (the centerlines) of the bulb filament and the slit be the same. The ground glass can be taped to a small piece of wood – in this case, the vertical dimension should be increased to 3”. ![]() In either case, the vertical edges that block the light must be parallel to the color lines so only one color is passed. The STOPS can be hand-held or taped to small blocks of wood. Rotate the bulb to obtain the highest illumination of the slit. The sharp edges and corners of the glass pieces can be ‘broken’ with fine sandpaper wrapped around a small piece of wood.Ī standard tungsten filament light bulb will not work as well as a halogen bulb – the halogen provides a much better spectrum. Ground glass is easily made using automobile engine valve lapping compound – place some compound between two pieces of ordinary window glass and rub them together.
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