Home › Weights And Measures › Foreign Gold and Silver Coins

Foreign Gold and Silver Coins

It requires a swelled chimney. By cutting off the A STATEMENT OF FOREIGN GOLD AND button a steadier light is obtained, and the economy is nearly the same; straight chimneys are more easily obtained than the others. The best flint-glass chimneys are in the end the cheapest; great loss of light ensues if they are not kept clean. But putting a chimney into hydrant-waputting a chimney into hydrant-water, and gradually heating it, it may be cleaned safely; paper gives the best finish. The larger the burner the greater the relative economy.

Relative Light for Unit of Gas.

Batswing.......... consuming 5 feet, 1.000 Large patent Argand burner ... } Common Argand..........

Single jet....

Fish-tail (Union jet).....

Large Batswing.

Wax candle, 4 to lb Sperm 6 66 Tallow " 5 " “ “ " “ " " ....

Photometry. " 6 2.880 5.4" 2.2 " 1.191 4.5"