d a time equation table, set the hand of the polar ring, containing the glass dial plate, the broad end of a coni- paper, has been completed and proved. clock to correspond thereto, and turn the vertical pillar on its The new gun will, it is expected, be of axis until the colors of the selenite… … present series of experiments with the not be applied in any confined situa- 34 tun gun will doubtless have thrown ' tion. The polar clock is consequently: considerable light upon this vexed ques- 85 TUN GUN. PROJECTILE 115 LBs. applicable in places where a sun dial tion. The trunnions are to be 16…
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