Abstract
In Blowing glass bulbs for projection lamps, there occasionally occurs in the glass small bubbles or slight ridges on the glass known as “striations.” Sometimes, a small mold mark is left in the glass. It seems to be impossible to entirely eliminate all of these little flaws. On several occasions, complaints have been received that blisters in lamp bulbs have been the cause of poor screen illumination. All of these complaints have been indefinite, and no specific data seemed to be available on the subject. In order to determine definitely whether or not there was any such detrimental effect, the authors, conducted a series of tests on lamps of various sizes and in different types of projectors.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Transactions of the Society of Motion Picture Engineers
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
