Dentists - Doctors - Inventors - Medicine - Science
Feb. 26 Debunking Expensive Lighting In Glasshouses: Dr. Hubbard with specimens which debunk claims by many manufacturing for expensive lighting in glasshouses. The plant on the left was grown under a simple clear tungsten bulb. Both plants are the same age but the one on the right was crown without lights. Five types of bulbs were used in these tests and clear tungsten lamps won out
Picture No
13205961
Media ID
46965805
Size
4455px x 5566px
(1.5MB)
Credit
(c) Keystone Pictures USA/ZUMAPRESS.com/Mary Evans
Usage Restrictions
Editorial Use Only - No Property or Model Releases. For any non-editorial use, please contact Mary Evans direct
Source
Keystone Pictures USA
