George Beaston explains that Clark wanted to "have an instrument that would give a continuous spray, and with this view he had a pair of Bergson's tubes fitted into the cork of a graduated glass bottle, and had attached to them a double hand bellows with suitable valvular arrangements which allowed of a constant spray being kept up for an indefinite time. This instrument was made for him by Krohne & Sesemann (London surgical equipment producer) in the spring of 1865, and has since been known as Clark's spray producer. It is seen in Fig. 1, and it will be at once recognised as merely an improved edition of Bergson's original idea.
You can see it was a little more compact than the original Bergson Inhaler, although still required some work to obtain a mist -- the squeezing of the bulb. There are also various other inhalers or nebulizers playing on this same theme, and you can check them out by clicking on the link below.
- Beatson, George, "Practical Papers on the Materials of the Antiseptic Method of Treatment," Vol. III, "On Spray Producers," Coats, Joseph, editor, "History of the Origin and Progress of Spray Producers ", Glasgow Medical Journal, edited for the West of Scotland Medical Association, July to December 1880, Vol. XIV, Alex and Macdougall, pages 461-484