I have used the spectroscope described below to image the spectra of high pressure sodium, mercury and incandescent lamps.
A star spectroscope has no slit, so it is difficult to get good resolution of sources that are not point sources. The globes of lamps are a far cry from points, even at a distance, so the spectra suffer from fat lines. This effect is reduced by using a spectrum stretcher, a pair of prisms that elongate a spectrum's lines:
These spectra were imaged digitally, while the much dimmer star spectra are recorded on fine grained high speed film, then scanned into a digital image.
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