Safety monitor for use with Watson-Odelca mass miniature x-ray set, by N.V. Optische Industrie (De Oude Delft), specialist makers of X-ray equipment and optical technology, Delft, South Holland, Netherlands, used at Ilford Chest Clinic, London, England, where patients diagnosed with tuberculosis could be treated, 1960-1961

A radiographer used this safety monitor with a mass miniature radiography set as controls on the unit ensure the correct procedure is followed. Distinct lights on the machine indicate several things. These include when the unit is ready to shoot, if the radiograph film has run out and if the filming cycle is complete. A second indicator also ensures a patient’s card, complete with personal information, is inserted into the holder before the X-ray is taken. The unit combines the X-ray image of the chest with an image of the patient’s card so no information is mismatched.