Inventors:
Robert B. Powers - Norwell MA
Donald Adams - West Bridgewater MA
Angelo A. Marsocci - Duxbury MA
Assignee:
American District Telegraph Company - Jersey City NJ
International Classification:
G01N 1506
Abstract:
An optical block for the exciter lamp and photocell includes a base with a first seat holding the lamp on a first optical axis and a second seat holding the cell on an intersecting optical axis. A cover with two light passages along the axes has a socket into which the base snap fits to confine the lamp and cell in their seats.