Who turned the lights out on Jeremy Bentham?

The auto-icon of Jeremy Bentham is 183 years old and counting.

Over this time it has attended parties and senate meetings, had its heads (wax and mummified) stolen by students, twice visited Germany and also taken a ride in a red Morris Marina. It's fair to say that Jeremy Bentham has led an active after life, and UCL Museums are committed to ensuring that it survives for another 183 years and more.

During recent conservation work it has become apparent that although the auto-icon appears safe and secure it is actually subject to a very damaging environmental factor - high light levels (Cue dramatic sounds and possibly someone screaming in the distance).

Ok so actually of all the risks the auto-icon faces this doesn't sound like a particularly bad one, especially compared to fires, wars, insect infestation and the afore mentioned head thefts (all of these the auto-icon has survived at one point in its life). But high light levels are a huge danger to the auto-icon, and can cause irreparable damage.

All sources of light, whether natural or artificial, can cause extensive and irreversible damage to materials. Some materials undergo chemical change - for example many inks, dyes and pigments will transform, causing fading or change in colour - while others undergo physical changes if overexposed - many textile fibres, for example, lose their mechanical strength.

Damaging effects

The auto-icon is made of many organic materials - wool, silk, leather, basketry, pigmented wax. These materials are particularly sensitive to the damaging effects of light.

The effects of light are cumulative, which means that the more light the auto-icon is exposed to over its life time the worse the damage will be. Between 1850 and 1898 its believed that the auto-icon was stored out of sight and out of mind in a store room or cupboard at UCL, rarely (if ever) being exposed to the light. This, along with the fact that it always appears to have been kept within the inner box it sits in now, means that it has been exposed to a relatively low level of lighting. But in the modern period, with the increase in use of electric lights, its expose has increased dramatically.

In order to safe guard its future we have made the decision to disconnect the strip lights within the auto-icons box, which are always on during opening hours. The spot lights, which are controlled by a sensor, will remain in use. This will mean that the auto-icon appears darker than usual, however when people get close the lights will still come on to allow visitors to view them as before.

We welcome all feedback. Please let us know what you think be leaving a comment below, or alternatively contacting me on nicholas.booth@ucl.ac.uk.

Nicholas Booth, UCL Museums and Collections