[Developing box]

Laboratory for daguerreotypes. Mercury box for developing daguerreotypes. The daguerreotype inclined at 45º, receives mercury vapors produced by an oil or alcohol lamp placed under the box. On the front, there is a thermometer indicating the internal temperature in Celsius and Fahrenheit (it could not exceed 75º). On the right side, there is a red glass for observing the daguerreotype development …