| colspan="2" style="text-align: center;" | On the left is a picture of the light guide which had been in 180 deg F distilled and on the right is the light guide which had been in 150 deg F distilled water. It is apparent that the first has been bowed, whether this is due to the difference in water quality or the temperature is hard to distinguish. | | colspan="2" style="text-align: center;" | On the left is a picture of the light guide which had been in 180 deg F distilled and on the right is the light guide which had been in 150 deg F distilled water. It is apparent that the first has been bowed, whether this is due to the difference in water quality or the temperature is hard to distinguish. |