![](https://coimages.sciencemuseumgroup.org.uk/723/879/large_thumbnail_smg00454019.jpg)
![](https://coimages.sciencemuseumgroup.org.uk/723/879/large_thumbnail_smg00454019.jpg)
![](https://coimages.sciencemuseumgroup.org.uk/345/128/large_thumbnail_smg00239450.jpg)
Box of "Argentic" silver nitrate caustic points
1925-1940
![](https://coimages.sciencemuseumgroup.org.uk/3/871/large_thumbnail_1979_0670_0008__0001_.jpg)
Veterinary thermometer, England, 1950-1978
1950-1978
![](https://coimages.sciencemuseumgroup.org.uk/731/262/large_thumbnail_smg00449865.jpg)
Gold Chloride
![](https://coimages.sciencemuseumgroup.org.uk/731/715/large_thumbnail_smg00449988.jpg)
Arrowmounts
1958-1960
![](https://coimages.sciencemuseumgroup.org.uk/479/349/large_thumbnail_smg00249232.jpg)
Standard Exposure Calculator
1920-1940
![](https://coimages.sciencemuseumgroup.org.uk/331/159/large_thumbnail_smg00077545.jpg)
Original packaging for the `Sylentflo' Electric Hair Dryer
1945-1965
![](https://coimages.sciencemuseumgroup.org.uk/41/263/large_thumbnail_1976_0635__0002_.jpg)
"Silent Six" electric extractor fan in brown phenolic plastic self-contained unit for window mounting
1934-1938
![](https://coimages.sciencemuseumgroup.org.uk/249/879/large_thumbnail_cd0746_061_161013_y1987_13_2_galvanometer.jpg)
Moving coil galvanometer
1937
![](https://coimages.sciencemuseumgroup.org.uk/730/172/large_thumbnail_smg00449605.jpg)
Johnson Exposure Tester
1945
![](https://coimages.sciencemuseumgroup.org.uk/729/594/large_thumbnail_smg00449869.jpg)
Johnson Pactum Unitex Fine Grain Developer
![](https://coimages.sciencemuseumgroup.org.uk/730/102/large_thumbnail_smg00448957.jpg)
Johnson Developing Tank
British Rail permanent-way floodlight
1945-1965
`Sylentflo' Electric Hair Dryer
1945-1965
Johnson Indoor Photography Outfit
Exposure calculator
Mercury thermometer
1950-1978
"Swinglite" lighting system by Johnsons of Hendon
1960
Johnson's reducer
Bottle of silver nitrate
Johnson Junior Printing Pack
1961
Johnson See-Thru Printing Masks. Two packets of three 2 1/2 x 3 1/2" with 2 1/4" apertures
Johnson white ink
Johnson Precision Colour Filters
Johnsons' See-thru Printing Mask
Johnson Exactus Postcard Printer
Johnson Precision Lens Hood
Johnson Plastic Printing Frame
Johnson Three-Tint actinometer
Johnson Roto-Two developing tank
Programme [for[ Royal Air Force Pageant, Hendon [on] June 28th, 1930
1930
Programme for Royal Air Force Aerial Pageant ... Held at the London Aerodrome
1923
[Programme for] The thirteenth Royal Air Force display [at Hendon Aerodrome on 25 June 1932]
1932
Everett, Edgcumbe and Company Limited moving coil galvanometer
1930
Deckle-Edger by Johnsons of Hendon
Johnson's Flash Powder Outfit with Instructions
Johnson's Adjustable Developing Tank with Carton and Instructions
Mercury thermometer
1950-1978