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Updated: September 15, 2025
A proverb synonymous to ours, of "What is bred in the bone, will never come out of the flesh." The tawa is a circular plate of malleable or cast iron, used for baking cakes or bannocks. It is slightly convex, like a watch-glass, on the upper side, where the bread is laid on; the under or concave side being, of course perfectly black.
Let us take one particular example, a very remarkable one, which has been cited by both writers Wolff's experiment on the lens of the eye. The lens is just behind the pupil or central aperture in the iris or coloured ring at the front of the eye, and behind the cornea which is to the eye what a watch-glass is to a watch.
Carrying it very carefully, he went up to the tent again and sat down beside his little heap of crumbled wood and held the watch-glass full of water over it. As he expected he found that it made an admirable burning-glass, its only drawback being that it was only available when the sun was overhead.
That we found in Blackmore's chambers a framed inscription of large size, hung upside down, together with what appeared to be the remains of a watch-glass and a box of stearine candles and some other objects." He passed the paper to me and I pored over it intently, focusing my attention on the various items with all the power of my will.
I took out my penknife and tried to scratch it vainly. Leaning forward towards the gas-lamp, I tried the thing on my watch-glass, and scored a white line across that with the greatest ease. I looked at my interlocutor with rising curiosity. "It certainly is rather like a diamond. But, if so, it is a Behemoth of diamonds. Where did you get it?" "I tell you I made it," he said. "Give it back to me."
In any case a watch-glass may be supported above the vessel by means of a glass triangle, or other similar device, and the danger of loss of material or contamination by dust thus be avoided. It is obvious that evaporation is promoted by the use of vessels which admit of the exposure of a broad surface to the air.
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