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DESCRIPTION OF THE FRONTISPIECE ILLUSTRATING 
MECHANICS. 
S' 
ARCHIMEDES, THE FOUNDER OF THEORETICAL xMECHANICS, IS REPRESENTED IN A 
CONTEMPLATIVE ATTITUDE, IN THE MIDST OF IIIS PUPILS AND OF THE INSTRUMENTS 
OF THE MECHANICAL POWERS. IN THE FORE GROUND A YOUTH IS TRACING ON THE 
SAND A DIAGRAM EXPRESSING THE FAMOUS DISCOVERY OF ARCHIMEDES, THE PRO¬ 
PORTION OF THE SPHERE TO THE CYLINDER; TO WHICH ANOTHER, LEANING ON A 
BOOK, IS ATTENTIVE. ON THE RIGHT HAND ARE SHOWN THE ACTION OF THE SCREW 
AND THE WEDGE, AND, HIGHER UP, OF THE BALANCE. FROM THE CEILING IS SUS- 
* 
PENDED A SYSTEM OF PULLEYS. ON THE LEFT IS A GLOBE, THE IIYDROSTATICAL 
BELLOWS, AND THE PUMP WHICH BEARS THE NAME OF ARCHIMEDES’S SCREW; THE 
ACTION OF THE INCLINED PLANE IS ALSO SHOWN IN THE LEFT CORNER; AND IN THE 
BACK GROUND, ON THE SAME SIDE, IS A YOUTH WORKING A CRANE, 
No. iotS, 
