Darkfieldmicroscopy

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There is something truly special about the moment the theatre lights dim and the curtain rises before a performance. The excitement one feels as they…

While the practical purpose of the ghost light may have diminished with the advent of modern lighting technology, the tradition lives on. For many theatre practitioners, the ghost light is a symbol of the history and heritage of theatre, a connection to the generations of artists who have worked in these spaces before them.

We all want our theatre seasons to run smoothly. From word-perfect lines to timely scene transitions, to precisely cued sound and lighting and quick costume…

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As we reflect on the history of the ghost light, we should also remember the many other traditions and superstitions that have been passed down through the centuries of theatre. From the Scottish play to the tradition of saying “break a leg,” these customs and beliefs serve as a reminder of the unique and storied history of theatre, and the enduring magic and power of live performance.

In normal bright-field microscopy, light is focused by an objective lens (characterized by its magnification and numerical aperture (NA), e.g. 50x/NA=0.75) onto the sample and the light either reflected (reflected light microscopy) or transmitted (transmitted light microscopy) by the sample is collected. The image contrast is primarily based on light absorption.

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After seeing over an incredible 170 productions in 2019, Theatre Haus and its team have shared their end of year #WallofFaves.  The #WallofFaves looks to…

The origin of the ghost light is somewhat unclear, but it is thought to have originated in the early days of gas lighting. Gas lighting was notoriously dangerous, and theatres were often the site of explosions and fires. To prevent such disasters, theatres began leaving a single gas light burning on the stage overnight, both as a safety measure and to keep the spirits at bay.

Widefield microscope

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Theatres have a long and fascinating history, with many traditions and superstitions passed down through the generations. One such tradition is the use of ghost lights, which are left on in theatres overnight to ward off any supernatural beings that might be lurking in the shadows.

Polarized light refers to light that has been filtered to vibrate in a single plane. It is especially useful in metallography for revealing the grain ...

In dark-field microscopy, the inner part of the illuminating light beam is blocked by a mask. Thus, only a sheet of light is focused onto the sample. In other words, the sample is illuminated under an angle that is defined by the NA of the objective lens. Only the fraction of light is detected, which has changed its angle upon interaction with the sample. The image contrast is primarily based on light scattering, enhancing the contrast of, e.g., small particles and sharp edges.

But the ghost light is more than just a symbol. It also serves as a reminder of the risks and dangers of working in theatre. As any theatre practitioner will attest, theatre is a live art form, full of unpredictable elements and potential hazards. The ghost light is a tangible reminder of these risks, and a warning to all those who work in the theatre to be careful and vigilant at all times.

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Criticalillumination

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Köhlerillumination

Over time, the use of ghost lights became more widespread, even as gas lighting was replaced by electricity. Today, many theatres still observe this tradition, leaving a single light burning on the stage after performances have ended.

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USB-powered light sources from Ossila are a simple yet versatile choice for fluorescence spectroscopic measurements, with wavelengths from UV to IR.