
Daylight Saving

Daylight Saving

The Metric System
The International Language of Weights and Measures

The New International Carat of Two Hundred Milligrammes—II
A Movement for Uniformity in Jewelers' Weights

The New International Carat of Two Hundred Milligrammes—I
A Movement for Uniformity in Jewelers' Weights

On the Diamond in the Canon Diablo Meteoric Iron and on the Hardness of Carborundum

The Farmington, Washington County, Kas, Aerolite

Precious and Ornamental Stones and Diamond Cutting