children

Pray, sir," said Lucy to the man, how do you make these thermometers V1The man said be would sbow her, and he took out of his box some long tubes of glass, and a long brass pipe, and a lamp. It was a lamp, with whicb he could melt glass. When he had lighted his lamp, it made a laige flame, which he blewwith a brass pipe, , , , , ,that he held in his mouth. Her father told her, that this pipe was called a blow pipe. With it the man blew the flame of the lamp, and directed it to one of the glass tubes, which he held in his other hand. In a little time, the heat began to melt the glass, and it melted into a round ball; this be heated again in the flame of the lamp, and when the glass was soft and melting, he closed that end of the pipe, and it looked like a lump of melted glass; then he blew air with his mouth in through the other end of the glass pipe, till the air blown withinside of the pipe reached the end, wbich was melting ; and the air being strongly blown against it, it swelled out into a bubble of melted glass, and thus made the bulb of a thermometer tube.

He left it to cool very slowly, and when it was cool, it became bard, and was perfect thermometer tube.Harry's father had some syphons and befit tubes of differ ent shapes made for him. Harry was very glad of this; , , ,,for be thought he could try many different experiments with these.The thermometer man now was paid and dismissed.As soon as he was gone, Harry and Lucy weft to their usual occupations ; for they never missed any day their regular lessons. Then came sawing woodthen walking outHappy children ! always doing something useful oragreeable.This evening, when they were sitting round the fire after dinner, and after his father had finished reading the newspaper, when he was not busy, Harry asked him what glass was made of.

I thought you had known that, long ago, Harry," said his father" Surely 1 have told you, have not I?"" Yes, papa, 1 believe1 daresay, you have; but I always forget; because I never was very curious, or much interested about it, till now;, , , , , but now when we have been seeing, and thinking, and talking so much about glass, I think I shall remember what it is made of, if you will be so good as to tell me once more."His father desired Harry to bring him some sand, which was lying in a paper in his studyHarry did so. Then his father said to his mother.