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At the same time, there is no doubt that it was to Sir Humphry Davy that the merit belonged of having pointed out the true law on which the safety-lamp is constructed.
Mr Meagles was at hand the whole time, always ready to illuminate any dim place with the bright little safety-lamp belonging to the scales and scoop. Between them they agreed upon the sum it would be fair to offer for the purchase of a half-share in the business, and then Mr Meagles unsealed a paper in which Daniel Doyce had noted the amount at which he valued it; which was even something less.
Hope, the Natural Philosophy Lectures of Sir John Leslie, and the Natural History Class of Professor Jameson. He also devoted several evenings in each week to the study of practical Chemistry under Dr. John Murray, himself one of the numerous designers of a safety-lamp.
When, at Pavia, he first met Volta: he found that Volta had put on full-dress to receive him. In August, 1815, Davy's attention was drawn to the loss of life by explosions of fire-damp, and by the end of the year he had devised his safety-lamp. The coal owners subscribed 1,500 pounds for a testimonial, gave him also a dinner and a service of plate. In October, 1818, he was made a baronet.
Stephenson’s experiments on fire-damp, and his labours in connexion with the invention of the safety-lamp, occupied but a small portion of his time, which was necessarily devoted for the most part to the ordinary business of the colliery.
For the pre-Darwinian age had come to be regarded as a Dark Age in which men still believed that the book of Genesis was a standard scientific treatise, and that the only additions to it were Galileo's demonstration of Leonardo da Vinci's simple remark that the earth is a moon of the sun, Newton's theory of gravitation, Sir Humphry Davy's invention of the safety-lamp, the discovery of electricity, the application of steam to industrial purposes, and the penny post.
Davy, of the safety-lamp, threw a volume of current across the gap between two sticks of charcoal, and the voltaic arc, forerunner of electric lighting, shed its bright beams upon a dazzled world. The decomposition of water by electrolytic action was recognized and made the basis of communicating at a distance even before the days of the electromagnet.
But when the meeting of coal-owners proposed to raise a subscription for the purpose of presenting Sir H. Davy with a reward for “his invention of the safety-lamp,” the case was entirely altered; and Stephenson’s friends then proceeded to assert his claims to be regarded as its first inventor.
The safety-lamp had been given to the miner, the caisson to the bridge-builder, the anti-friction metal to the mechanic for bearings. It was already known how to vulcanize rubber, and how to galvanize iron. The application of machinery in the harvest-field had begun with the embryonic reaper, while both the bicycle and the automobile were heralded in primitive prototypes.
But a humbler though not less diligent and original thinker had been at work before him, and had already practically solved the problem of the Safety-Lamp. Stephenson was of course well aware of the anxiety which prevailed in the colliery districts as to the invention of a lamp which should give light enough for the miners to work by without exploding the fire-damp.
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