Adlut gasmin camer
Cameras with flash sync triggered the flashbulb a fraction of a second before opening the shutter, allowing faster shutter speeds.
A flashbulb widely used during the 1960s was the Press 25, the (about 1 inch (25 mm) in diameter) flashbulb often used by newspapermen in period movies, usually attached to a press camera or a twin-lens reflex camera. Other flashbulbs in common use were the M-series, M-2, M-3 etc., which had a small ("miniature") metal bayonet base fused to the glass bulb.
An alternative to ribbon was flash powder, a mixture of magnesium powder and potassium chlorate, introduced by its German inventors Adolf Miethe and Johannes Gaedicke in 1887.
A measured amount was put into a pan or trough and ignited by hand, producing a brief brilliant flash of light, along with the smoke and noise that might be expected from such an explosive event.
With the help of engineer William Mather, who was also a director of the company, they produced flat magnesium ribbon, which was said to burn more consistently and completely so giving better illumination than round wire.
Most current flash units are electronic, having evolved from single-use flashbulbs and flammable powders.
This could be a life-threatening activity, especially if the flash powder was damp.
An electrically triggered flash lamp was invented by Joshua Lionel Cowen in 1899.
Il modo più economico per scaldare l’acqua in casa? Ne abbiamo testati 8 modelli per potervi dire quali sono i più sicuri, quelli meno rumorosi e quelli che rispettano di più l’ambiente.
Con 200 o 300 euro si può portare a casa uno scaldabagno a gas di buona qualità, ma attenzione alle differenze di prezzo tra un negozio e l’altro: in un caso arrivano persino a 180 euro.
A variety of magnesium ribbon holders were produced by other manufacturers, such as the Pistol Flashmeter, which incorporated an inscribed ruler that allowed the photographer to use the correct length of ribbon for the exposure they needed.