A documentary film with elements of a fiction film tells about the creation by the staff of the light welding department of the Moscow Aviation Technological Institute named after V.I. E. Tsiolkovsky welding machine with an incandescent lamp used in a film projection apparatus. The film uses fragments of the movie "Funny guys" (sinhr.). The film includes the following filming: glass production: a glass blower blows a product out of liquid glass - a lamp; employees of the MATI light welding department in the laboratory of the institute for the creation of a welding installation, for the installation of a special device for adjusting the welding installation, the type of installation during operation.