Calotype

Calotype (Talbot photography, 1842 or about 1843)

The calotype (Calotype) is the photograph technique that scientist William Henry Fox Talbot of the U.K. invented. I was named by Καλος (Kalos is beautiful) of the Greek [¹]. It was the first-ever negative-positive process, and a reproduction was superior to daguerreotype at a point to be possible.

The manufacturing method ranks a salt solution [¹] and does dry [¹] paper [¹] which impregnated silver nitrate solution after having done it with sensitized goods and I put it in camera オブスクラ [¹] and do photography [¹] and I settle with the developing, potassium bromide (sodium thiosulfate) solution with silver nitrate, acetic acid, a gallate mixture and get a negative image of 6cm *6cm [¹]. The exposure was around one minute the outdoors of the fine weather.

The oldest photograph was photographed to 1835 [¹] in the photograph which Talbot photographed by the window [¹] of the study of the villa, and in the science museum of London [¹]. Talbot invented this principle in August, 1835, but it was form to have its honor of the photograph invention stolen without making the manufacturing method a secret, and gathering up a report to hear what Louis Jack マンデ Daguerre invented daguerreotype and announced in 1839 hastily [¹], and wanting to insist on priority of the photograph invention, and [¹] being recognized [¹].

At this point, gradation of the light and shade was a reverse negative image, but I completed success, negative-positive process in getting a positive image by copying a negative image afterwards and acquired U.K. patent in 1841. It is that the number of is how many and can make a photograph from one piece of negative because the big advantage of this method gets a positive image by copying [¹]. Because I copied paper when I made a photograph with a positive image, it seemed to me, and fiber was crowded, and there was not the acumen such as the daguerreotype, but the photograph which kept the matter such as the picture alive was made [¹].

French イポリット Bayard (Hippolyte Bayard) invented approximately similar photography in 1839, too, but his invention was still less accepted as well as Talbot.

Improvement is carried out, and a photograph wet plate, photographic plate are invented, and a picture of the reproduction will improve afterwards.

Source

[Help]

1. ^ ^{a b c d e f g h i j k l m n o} "history camera pp.15-16 of the invention."

References

• Association of Hachiro Suzuki "history camera invention of the invention"

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