Improvement in Devices for Taking Azimuths Patentee: William Thomson - lasgow Scotland Granted:1878-11-19

The instrument is placed onto the center of the mariners' compass, and the integral mirror is then used to sight an object on the horizon while simultaneously reading the heading on the compass card.
This is one of 41,646 patents currently in the database at datamp.org

Portable electric hand saw Patentee: Francis D. Dolan - Toledo OH Granted:1956-05-01
Manufactured by American Floor Surfacing Machine Co. - Toledo OH
Assigned to American Floor Surfacing Machine Co. - Toledo OH


This is one of 41,646 patents currently in the database at datamp.org

Depth Gage Patentee: Albert Snoeck - Ensival Liege, Belgium Granted:1893-01-31

This invention has for its object the production of a novel gage by which to readily ascertain the diameter of holes, the instrument as made being also available for use in measuring the depth of a hole or cavity, or the depths of different parts of a hole or cavity of unequal depth. The tool to be described consists essentially of a tapering spindle and a co-operating sliding index provided with suitable scale marks to designate the standard twist drill gage, or to designate fractions of an inch, as for instance, thousandths of an inch, the index containing one or both these scale marks, or it may be any other suitable or desired scale marks.
This is one of 41,646 patents currently in the database at datamp.org

Micrometer Gage Patentee: Joseph P. Lavigne - New Haven CT Granted:1892-12-20

Earle & Seymour - patent attorneys Joseph P. Lavigne owned the Lavigne Micrometer Co. of New Haven, CT. This invention relates to an improvement in that class of calipers or gages which are adapted to be set or to measure with the greatest accuracy, and commonly called "micrometer gages" or "calipers," the object of the invention being to adapt the gage to be readily adjusted to units of measurement, but with positive accuracy.
This is one of 41,646 patents currently in the database at datamp.org

Lathe Dog Patentee: Henry K. White - Chelsea MA Granted:1871-03-14

Crosby and Gould - patent attorneys In turning small round stuff, like chair legs, in wood turning lathes, it is customary to fasten one end of the stick by forcing it against a mandrel-dog, having radial teeth, that sink into the wood and hold it fast, or cause it to be held fast between the dog and the back poppet, so that the stick turns with and by the rotating mandrel. These teeth are very liable to split the wood, especially when the wood is turned down nearly to them and the object of my invention is to so construct the clamping-dog as to insure the wood against any liability to split by the action of the teeth; and for this purpose I make or provide the dog-stock with an encompassing-sleeve or tube, which is internally screw threaded or nut-threaded, and works upon a male thread on the stock, the front end of the tube being made sharp, so that, when fed up into the plane of the ends of the dog-teeth, or slightly projecting beyond them, the said edge shall strike into the end of the stick to be turned, thereby holding the material, into which the teeth enter, and effectually preventing it from splitting, although the turning-tool may cut down to the tube.
This is one of 41,646 patents currently in the database at datamp.org