The Story of a Tinder-box

Produced by Chris Curnow, Ritu Aggarwal and the Online Distributed Proofreading Team at http://www.pgdp.net (This book was produced from scanned images of public domain material...

Now, then, comes a very remarkable story to which I desire to draw your attention. There were many disadvantages in the use of this yellow phosphorus. First of all, it is a pois...

Heat then is generated by mechanical force; it is a mode of motion. There was an old theory that heat was material. There was heat, for instance, you were told, in this nail. Su...

I want you, if you will, to go a step further The heat of the flame is due, as I explained in my last lecture, to the clashing of molecules. But what is the light of my candle a...