3 ms·
Can someone explain how they manage to 'calibrate' the hourglass to 60seconds (or whichever time they choose)? Is it done by trial and error or they can make ho
by pedrokost 15y ago
Can someone explain how they manage to 'calibrate' the hourglass to 60seconds (or whichever time they choose)? Is it done by trial and error or they can make hourglasses so precisely that they the width of the slit precisely determines the time-length? I doubt such precision can be achieved in manual labor.
- bradleyland 15y agoThe orifice size needs to be fairly consistent, which requires talented artisans, but some variation is unavoidable, so they have sands of different coarseness for varying sizes. The timing is calibrated by adding/removing san [1]. Scroll down to "The Manufacturing Process" in the footnote link. 1 - http://www.enotes.com/how-products-encyclopedia/hourglass http://www.enotes.com/how-products-encyclopedia/hourglass
- deleted 15y ago[deleted]