Hook Gauge

Instrument for precisely determining the elevation of the surface of water by means of a pointed hook IMG:content-0641.jpg:[merged small][graphic] IMG:content-0642.png:[graphic][merged small] IMG:content-0643.png:[blocks in formation] IMG:content-0644.png:[blocks in formation] IMG:content-0645.png:[blocks in formation] IMG:content-0646.png:[graphic] IMG:content-0647.jpg:[ocr errors] of R. I. 1751-54; repeat- edly Gov.; in Congre 1774-78; signer of the Declaration of the earth's crust; another on the varying effect of the sun's and the moon's attraction according as the earth be supposed to be solid or to be formed of a fluid interior surrounded by a rigid shell.