The London, Edinburgh and Dublin philosophical magazine and journal of science . 9. The spark to be photographed was produced in A (fig. 3)within a large wooden box, intercepting any irradiation oflight by the This box, C, had a hole 0 capable o£ being opened andclosed by means of an ordinary pneumatic shutter, as usedin photography. A card-paper tube reaching as far as the objective L (anastigmatic Zeiss objective) projected from 0. The imageformed by L was reflected, by the rotating mirror S on to thephotographic plate F, if the mirror was in the proper position. Oscillatory Discliar
The London, Edinburgh and Dublin philosophical magazine and journal of science . 9. The spark to be photographed was produced in A (fig. 3)within a large wooden box, intercepting any irradiation oflight by the This box, C, had a hole 0 capable o£ being opened andclosed by means of an ordinary pneumatic shutter, as usedin photography. A card-paper tube reaching as far as the objective L (anastigmatic Zeiss objective) projected from 0. The imageformed by L was reflected, by the rotating mirror S on to thephotographic plate F, if the mirror was in the proper position. Oscillatory Discliarges. 11 A suitable screen prevented the light emitted by theopening sparks of the electromagnetic tuning-fork falling onthe photographic plate (so as to avoid any ghosts prejudicialto the clearness of images). 10. Experiments were carried on in the following way:—The pressure of air in the reservoir having reached 5 to 6atmospheres, the photographic plate was placed in position ;then, after starting the electromagnetic tuning-fork, thecompressed air was led into the turbine, the rate of itsentering the turbine being regulated by means of a con-venient screw-cock, enabling the velocity to be augmentedslowly
Size: 1727px × 1446px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1840, bookidlondon, booksubjectscience
