It was not an easy task, as they had to produce selenium cells with the desired properties themselves.

The receiver was a parabolic mirror with selenium cells at its focal point.

On the other hand, selenium cells are known to degrade over time, losing accuracy or eventually failing.

Matthews claimed that he had created a remote control system that used selenium cells.

It was motor operated and controlled by a light beam through selenium cells placed behind lenses used for eyes.

Selenium cells, however, could easily be judged for their light sensitivity by simply looking at the size of the cell's metering surface.

While the selenium cell area was big, the add-on made the camera look clumsy and unattractive.

Although the selenium cell photometer was proving successful, it was difficult to use and not very sensitive.

Light meter using selenium cell, no battery.

Selenium cells found other applications however, for example as light sensors for exposure timing in photo cameras, where they were common well into the 1960s.

He had always imagined them to be the normal pick-up by the sensitive selenium cells of stray currents in the machine's framework.

In its ultimate electronic form, the photophone receiver used a simple selenium cell at the focus of a parabolic mirror.

The meter utilized a large selenium cell panel on the front of the viewfinder prism to detect light levels.

The selenium cell exposure meter is now coupled to a "setting wheel" located on the very bottom of the lens mount.

Compared with the earlier copper oxide rectifier, the selenium cell could withstand higher voltage but at a lower current capacity per unit area.

When one selenium cell was no longer in the light beam, it would be steered in the opposite direction back into the beam.

The main deficiency was the Selenium cell used for converting light waves into electric impulses, which responded too slowly thus spoiling the effect.

A selenium cell would be mounted on the tip of each of the rocket's four tail fins, with the cells facing backwards.

The selenium cell was used in the photophone developed by Alexander Graham Bell in 1879.

Moving images were not possible because, in the scanner, "the sensitivity was not enough and the selenium cell was very laggy".

They used a diffused silicon p-n junction that reached 6% efficiency, compared to the selenium cells that found it difficult to reach 0.5%.

The non-coupled selenium cell exposure meter reads out in exposure values (EVs) only.

Upon this dry call of selenium cell (that horn of lunghalloon, Riland's in peril!)

Harry Grindell Matthews created a system using selenium cells and this time demonstrated his invention to the Admiralty.

More sensitive molybdenite receiver cells, which also had greater sensitivity to infra-red radiation, replaced the older selenium cells in 1917.