. Time and its measurement . eing very fallible and limited inhis capacity, would have all he couldproperly do to adjust four jars, andthat his record would average betterthan it would with a greater , this man lived thousandsof years before the modern mathemati-cian who constructed a bell-shapedvessel with a small hole in the bottom,and proportioned the varying diameterin such a mannerthat in emptyingitself the surfaceI if the water sankequal distances inequal times. Thesand glass, Fig. 9,l»ietically calledihe hour glass,belongs to thewater-clock classand the sa n dHows from on
. Time and its measurement . eing very fallible and limited inhis capacity, would have all he couldproperly do to adjust four jars, andthat his record would average betterthan it would with a greater , this man lived thousandsof years before the modern mathemati-cian who constructed a bell-shapedvessel with a small hole in the bottom,and proportioned the varying diameterin such a mannerthat in emptyingitself the surfaceI if the water sankequal distances inequal times. Thesand glass, Fig. 9,l»ietically calledihe hour glass,belongs to thewater-clock classand the sa n dHows from onebulb into theother, but it givesno subdivisions ofits period, so ifyou are using oneFig. 9—Modern Sand running au houT Glass or Hour Glass •, , * , it does not giveynu the half sand glass is still in use by chair-men, and when the oldest inhabitantgets on his feet, I always advise settinga 30-minute glass on him. In the Tower of the Winds atAthens, Greece (Fig. 10), we have alater weather bureau station. It is.
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Keywords: ., boo, bookcentury1900, bookdecade1900, booksubjectclocksandwatches
