REPAIR & TROUBLESHOOTING - Benson Selenium Cells

Comprehensive technical treatise on the fabrication and practical use of selenium cells, with particular emphasis on the Fritts cell design. This authoritative manual documents the complete construction process from initial material selection through final assembly and testing procedures.

The work commences with a scientific examination of selenium as an element, covering its discovery, classification, and three primary forms: amorphous, vitreous, and metallic. A comparative analysis follows of various cell types including Bildwell, Ruhmer, Bell and Taintor, Mercadier, and Gripenberg designs, detailing design factors and operational characteristics specific to each configuration.

The construction section provides precise specifications for Fritts cell manufacture, encompassing descriptions of the hot-press apparatus, required accessories, copper plate preparation, selenium application procedures, and gold foil application techniques. The testing and maturation chapter presents measurement methodologies utilizing the Wheatstone bridge technique, light sensitivity evaluation protocols, proper voltage determination, and cell classification systems based on performance metrics.

Additional coverage includes reconstruction procedures for defective cells, sealing methodologies, and practical applications of selenium cells. This work represents an invaluable reference for historians of technology and individuals engaged in restoration of vintage optical and photographic instruments utilizing selenium-based detection systems.