Pulpit Two-Hour Glass American, 1700-50 in the Essex Institute, Salem, Mass.
Silver Gilt French Hour Glass Eighteenth Century in the Metropolitan Museum
Types of the Earliest Time Telling Devices
The sun dial is the first ancestor of all time tellers, and the sand glass was probably the first portable time telling device.
In the modern application and practical use of all this, on the other hand, we owe them nothing. They never made a clock or watch, or any like device which has more than a merely ornamental use to-day. They gave us the general plan so well that we have never bettered it, but they left later generations to work out the details. They invented the second as a division of time but they did not measure by it. They did not care to try. For them, learning was the natural right and power of the few, and the gulf between the most that was known by the few and the little that was known in general, was like the gulf between great wealth and great poverty among ourselves.
Indeed, in this age of teaching and preaching, when a thought seems to need only to be born in order to be spread abroad over the world, it is hard for us even to conceive the instinct by which men kept their learning like a secret among the initiated and felt no impulse to make known that which they knew.