Alfred Swaine Taylor employed ammonia nitrate of silver in preference to chloride of silver for making photogenic drawings, and employed hyposulphite of lime in preference to hyposulphite of soda for fixing.
I send you the only copy I have of my photogenic drawing.
In nothing, perhaps, is the chemical agency of light more clearly shown than in the photogenic drawings, which are the fac-simile representations of objects delineated by the action of light on a thin sensitive layer of ioduret of silver.
The photogenicimages of glass articles impress the sensitive paper with a very peculiar touch, which is quite different from that of the China in Plate III.
He photo opportunities with photogenic refugees and promised the soft spoken and dreamy eyed Prime Minister of Macedonia 20 million British Pounds.
The effect is to lessen the contrast, by giving the freckles and skin the same color and the photogenic intensity of the red and yellow being nearly the same, an impression can be produced perfectly clear.
This being the case, I conclude there must be a point between the two extremes where light and dark objects will be in photogenic equilibrium.
But as I was not aware of the power of mercurial vapour to bring out the latent impressions, I found my plates of iodised silver deficient in sensibility, and therefore continued to use in preference my photogenic drawing paper.
After ten seconds of exposure, I put the prepared plate in the mercury box, and I obtained a round image perfectly black;--the sun had produced no photogenic effect.
Arago, in his paper entitled Considerations relative to the action of Light: “It is by no means proved that the photogenic modifications of sensitive substances result from the action of the solar light itself.
It is therefore certain that the use of gallate of silver as a photogenic agent had been made public in two lectures by Mr. Brayley at least two years before Mr. Talbot's patent was sealed.
The photogenic paper will now show a more or less white and distinct representation of the object.
The page being ready, a negative photograph is produced from it, from which the requisite number of positive photogenic copies may be obtained.
These incidents are considered as the first steps towards the discovery of the Photogenic art.
We shall now proceed to describe the various processes for Photogenic drawing on paper; first, however, impressing on the mind of the experimenter, the necessity which exists for extreme care in every stage of the manipulation.
Before taking leave of the subject of photogenic drawing, I must mention one or two facts, which may be of essential service to operators.
Ponton used a paper saturated with bichromate of potash, and this was one of the earliest photogenic processes.
After thephotogenic drawing or positive copy is taken, it is fixed by being placed in a solution of hyposulphite of soda, consisting of one fluid ounce of saturated solution to eight of water.
Reversibility of the Photogenic Reaction in Cypridina.
The tracheoles pass through this and either end openly within the photogenic cells or anastomose with tracheoles from neighboring tracheae.
On the Influence of the Prolonged Action of Liquid Air on Micro-organisms and the Effect of Mechanical Trituration at the Temperatures of Liquid Air on Photogenic Bacteria.
Sectional view ofphotogenic organ of a fish, Argyrophelecus affinis (after Brauer).
Some Observations on a Photogenic Microorganism, Pseudomonas Lucifera, Molish.
Distal portion of malpighian tubule of Bolitophila, showing modification to form photogenic organ (after Wheeler and Williams).
On the other hand, we should expect photogenic reactions, in which some of the chemical energy is converted into radiant energy, to give off much more light the greater the reaction velocity.
Experiments on the Nature of the Photogenic Substance in the Firefly.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "photogenic" in a variety of sentences. We hope that you will now be able to make sentences using this word. Other words: photo; photogenic; photographic
