Hi Everyone,
Does anyone know what optical device the below sliderule would relate to? Along the top you can see it has marks for 4m 12x, 19x, 24x etc. Any help would be greatly appreciated!
Does anyone know what optical device the below sliderule would relate to? Along the top you can see it has marks for 4m 12x, 19x, 24x etc. Any help would be greatly appreciated!