Specification of William Howarth and Ambrose Howarth : dental lathes.

  • Howarth, William.
Date:
1875
Catalogue details

Licence: Public Domain Mark

Credit: Specification of William Howarth and Ambrose Howarth : dental lathes. Source: Wellcome Collection.

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    Provisional W. Sr A. Howarttis Improvements in Dental Lathes. The headstock of our improved lathe consists of a spindle with a toothed wheel at each end; these pinions gear into other pinions fixed on short axles, each set of axles being supported in a box with a face plate. These short axles have taper sockets in which the different tools are fixed, and the articles of dentistry or other articles to be operated 5 upon are presented to the different tools in succession. Our Invention may be modified by making the driving pulley with an internal toothed wheel on each side, and these internal wheels gear into the pinions of two sets of short axles, passing through stationary face plates. These short axles have sockets to receive the tools, as above 10 described. Our Invention may be further modified by driving the short axles by friction instead of toothed gearing, as described. SPECIFICATION in pursuance of the conditions of the Letters Patent, filed by the said William Howarth and Ambrose Howarth in the 15 Great Seal Patent Office on the 22nd July 1875. TO ALL TO WHOM THESE PRESENTS SHALL COME, we, William Howarth and Ambrose Howarth, both of Bradford, in the County of York, Dentists, send greeting. WHEREAS Her most Excellent Majesty Queen Victoria, by Her 20 Letters Patent, bearing date the Twenty-eighth day of January, in the year of our Lord One thousand eight hundred and seventy-five, in the thirty-eighth year of Her reign, did, for Herself, Her heirs and successors, give and grant unto us, the said William Howarth and Ambrose Howarth, Her special licence, that we, the said William 25 Howarth and Ambrose Howarth, our executors, administrators, and assigns, or such others as we, the said William Howarth and Ambrose Howarth, our executors, administrators, and assigns, should at any time agree with, and no others, from time to time and at all times thereafter during the term therein expressed, should and lawfully might make, 30 use, exercise, and vend, within the United Kingdom of Great Britain