Improvements in and in the manufacture of clinical and other thermometers, and in apparatus therefor / [Edward Sebastian Arrighi].

  • Arrighi, Edward Sebastian.
Date:
1892
Catalogue details

Licence: Public Domain Mark

Credit: Improvements in and in the manufacture of clinical and other thermometers, and in apparatus therefor / [Edward Sebastian Arrighi]. Source: Wellcome Collection.

    1/6
    A.D. 1891 22,639 Date of Application, 28th Dec., 1891 ' o nnlete Specification Left, 28th Oc1., 1892—Accepted, 3rd Dec., 1892 PRO VISIONAL SPECIFICATION. Improvements in and in the Manufacture of Clinical and other Thermometers, and in Apparatus therefor. I Edward Sebastian Arkighi of 29 Elmira Street Lewisham in the County of Kent Glass Blower do hereby declare the nature of this invention to he as follows :— My invention relates to improvements in and in the manufacture of clinical and 5 other thermometers and in apparatus therefor. It has been proposed to form the tubing from which clinical thermometers are made but more especially that class of thermometers which are provided with a lens or magnifying front with a strip of white enamel extending all round the back and sides of the tubing but leaving only the narrow “lens front” or that part 10 through which the column of mercury is seen of clear glass in order to guide the eye of the user to the correct line of sight. In the manufacture of clinical thermometers by reason of the bore being so very minute it is essential for the workman in order to produce good results to have a clear view thereof and therefore in the manufacture of thermometers of the 15 character above referred to considerable difficulty is met with by the workmen in consequence of the bore being practically hidden from his view. Now the object of my present invention is to remove this difficulty by enabling the workman to have a clear view of the bore during his manipulation of the tube. For this purpose in lieu of continuing the enamel strip all round the back and 20 sides of the tube as hereinbefore described I draw the tube with the ordinary strip of enamel behind the bore and which serves to reflect the column of mercury as is well understood and in addition to such reflecting strip I form the tube with a separate strip of enamel upon each side of the lens or other front or line of sight and I mark upon one or both of these side strips the necessary graduations or 25 divisions. By these means I greatly facilitate the manufacture of this class of thermometer tube and by admitting light to the sides of the column of mercury I enable the same to be more readily seen when the thermometer is in use. In the manufacture of thermometer tubing according to my invention I employ 30 a V shaped trough or mould which is located above a chamber in which are arranged several Bunsen burners which serve to keep the mould at a suitable temperature for the purpose hereinafter described and 1 form perforations in the sides ot the mould to allow of the escape of the products of combustion from the Buusen burners. 35 Along the sides of the mould I lav strips of enamel which T support upon ledges or supports fitted into the bottom of the mould or otherwise arranged and the strips of enamel are retained in a heated state by the gas heat. I now take a ball of ordinary thermometer glass provided with the usual strip of enamel at the back of the bore and introduce it into the mould and work it 40 until the side strips of enamel have combined therewith and I then reheat and draw it into a thermometer tube in the customary manner the side openings between the side strips of enamel and the reflecting strip affording a clear view of the bore during the whole of the subsequent operations. By the employment of the apparatus hereinbefore described I am euabled to 45 keep the work at a suitable heat during the application of the side strips of [Price 8d.J