mains open for about one half stroke. The grade of expan sion is thus regulated with great precision by the governor. The gear makes no noise when at work excepting a slight clicking sound ; and it is of great durability asaiter a months running it showed no signs of wear although the cam plates were only of wrought iron hardened with prussiate of 'potash. The Utilization of Tide Power. Surface Friction in Water. Manufacture of Carbonate of Potash. The August Meteors, scientific american, 1872-10-26
mains open for about one half stroke. The grade of expan sion is thus regulated with great precision by the governor. The gear makes no noise when at work excepting a slight clicking sound ; and it is of great durability asaiter a months running it showed no signs of wear although the cam plates were only of wrought iron hardened with prussiate of 'potash. The Utilization of Tide Power. Surface Friction in Water. Manufacture of Carbonate of Potash. The August Meteors, scientific american, 1872-10-26
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