THE USE OF GLYCOLhyphen;PHTHALIC ANHYDRIDE RESIN AS A HIGHhyphen;VACUUM CEMENT

摘要

By using ethylene glycolhyphen;phthalic anhydride resin to seal the top of a camera box in a magnetic spectrograph it was found that a high vacuum could be obtained after pumping a short time. The preparation of the resin and its characteristics are described.