With spectrographs of high dispersion it is impractical to record the whole spectrum from 2,000—10,000 A on one continuous photographic plate or film. For this reason many large spectrographs are made readily adjustable to focus any selected wavelength range on to a standard size photographic plate, generally 10" × 4". The situation can arise where plates exposed on different but overlapping wavelength ranges have to be compared, but the lateral adjustment on standard comparators is insufficient. In this laboratory an early model Judd-Lewis Comparator has been permanently adapted and used for a number of years for this purpose. Figure 1 shows the attachment in position on a current model.

PDF Article

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
Login to access OSA Member Subscription