Detective Camera is a camera naming category. At the end of the 19th century the name detective camera was given to hand cameras of various types.
“In 1886 C. P. Stirn bought the rights to make a unique kind of vest pocket camera that was...Stirn Concealed Vest Camera
“In 1886 George Eastman and Franklin M. Cossitt received the patent for their Eastman Detective...Eastman Detective Camera
“Scovill & Adams offered its 4x5in Waterbury Detective Camera, improved model, ca. 1892. The...Scovill Waterbury Detective Camera
“This is a so-called detective camera made of mahogany. It contains 12 plates of 9x12 cm. Lens...Mars Camera
“Emil Wünsche's Detectiv-Camera "Photo-Jumelle" was a folding variant of the popular...Emil Wünsche Photo-Jumelle