US Patent: 481,241
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| Ship's Log
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Patentee:
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| John S. Negus (exact or similar names) - Brooklyn, NY |
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Patent Dates:
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| Applied: |
Apr. 22, 1892 |
| Granted: |
Aug. 23, 1892 |
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Patent Pictures:
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Joel Havens
Martin J. Donnelly Antique Tools
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Description: |
| Herbert Blossom - patent attorney
My invention relates to that class of ships' logs "wherein a registering mechanism on board the moving vessel indicates the rotations of a propeller or rotator in the water through the medium of a rope or line. When logs of this character are used in rough water, the motion of the vessel and the lateral swerving of the rotator-line put the latter under varying strains and cause it to whip or lash about, thereby subjecting the spindle of the registering mechanism, to which the line is secured, to severe side draft in addition to the direct "pull" of the rotator. Under these conditions the rotative force of the rotator is applied through the line to said spindle with great irregularity, causing the latter to "race" or rotate with excessive rapidity at times and at other times to nearly or quite stop, and this tendency is greatly increased by the heavy side draft and consequent increase in friction to which the spindle of the log as ordinarily constructed is frequently subjected. Some attempt has been made in constructing such logs to lessen the friction which resists rotation of the spindle when a direct longitudinal pull is applied thereto, antifriction - rollers being interposed between the bearing-surfaces, but so far as I am aware no attempt has been made to lessen the friction and wear produced by the lateral or oblique strains applied to the spindle; and the object of my invention is in part to provide an antifriction-bearing at its inner end to reduce the friction due to the direct longitudinal pull and another antifriction-bearing at its outer end to reduce the friction due to lateral or oblique strains. Other features of the invention relate to the mounting of the log in swivel-bearings.
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