Image articles
What is the signature visual characteristic of the cyanotype process invented by Herschel?
In what year was Sir John Herschel's cyanotype process invented?
What chemical agent did Herschel discover was crucial for *fixing* silver-based images, stopping further light sensitivity?
Which term, related to photography, was coined by Sir John Herschel?
What two chemical solutions are required to coat a substrate for the cyanotype process?
Who was the first contemporary to extensively document subjects using Herschel's cyanotype process, starting around 1843 or 1844?
What specific subject matter did Anna Atkins use the cyanotype to illustrate in her publication?
What is the intensely colored, stable pigment formed when ferric salt is reduced and reacts with potassium ferricyanide?
What was John Herschel's primary scientific career that influenced his approach to optics and light sensitivity in chemistry?
What post-exposure step is crucial for removing unreacted chemicals in the cyanotype process?
What Greek words did Herschel derive the term 'photography' from?
Which chemical did Herschel discover could effectively dissolve unexposed silver salts to permanently fix an image?
In what year did Sir John Herschel invent the cyanotype process?
What common trade name became universally known for sodium thiosulphate, Herschel's fixing agent?
What insoluble pigment results in the distinctive blue color of a finished cyanotype print?
What essential conceptual structure, foundational to later film photography, did Herschel introduce alongside the term 'photography'?
What types of salts formed the chemical basis of the cyanotype process, differentiating it from silver-based portraiture chemistry?
Which chemical is one of the two primary components Herschel used to coat surfaces for the cyanotype process?
Herschel viewed his photographic experimentation primarily as what kind of problem to solve?
Besides his work in photography, Sir John Herschel succeeded which famous relative in astronomy?
What is the typical frequency range for diagnostic ultrasound systems?
What is the core component inside the transducer responsible for generating sound pulses?
Why is a coupling medium, usually gel, necessary between the probe and the skin?
In B-mode imaging, what determines the brightness of each dot on the screen?
What specific function is M-mode (motion mode) imaging best suited for?
Doppler ultrasound is primarily used to reveal what characteristic within anatomical structures?
What major safety advantage does ultrasound imaging possess compared to X-rays or CT scans?
Which structures are known to significantly limit or obscure views during an ultrasound examination?
How does the ultrasound system precisely calculate the depth of a reflecting structure using the Time of Flight measurement?