On this day in 1903 Florentine A. Jones was granted the patent for RECORDING PEN. U.S. Patent No. 743,725.
This invention relates to that class of pens or marking devices that are employed in connection with gages, thermometers or other instruments for recording pressures, temperatures, and their variations. Pens of this class are of necessity very small, and it is exceedingly difficult to conduct the ink from the interior of the pen to the chart or recording dial in a regular and even manner, so as to produce a clear line of a uniform width on the chart or dial, owing to the very small quantity of ink required. Under these conditions it will be readily understood that the ink recording wire or stylus should be protected as far as possible from all danger of derangement when in the hands of unskilled or careless persons.
The object of this invention is to produce means for holding the stylus in the fixed position properly adjusted to its work, said means being not only independent of the cap which is used to close the reservoir, but is concealed within the reservoir and there fore sufficiently inaccessible to be out of easy reach, so that the stylus cannot be readily deranged, and thereby prevented from working, and, furthermore, cannot be lost through carelessness or negligence. The stylus held in place by the means embodying this invention enables the reservoir of the pen to be filled with ink without removing the stylus and prevents its derangement or loss out of the pen.
