The micrometer syringe / by John William Trevan.

  • Trevan, J. W. (John William)
Date:
[1925?]
Catalogue details

Licence: In copyright

Credit: The micrometer syringe / by John William Trevan. Source: Wellcome Collection.

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    / . U/ V | [From THE BIOCHEMICAL JOUKNAL, Vol. XIX, Xu. (i, 1925] [All Rights reserved] CLIX. THE MICROMETER SYRINGE. By JOHN WILLIAM TREVAN. From the Wellcome Physiological Research Laboratories, Beckenham, Kent. t (Received November 4th, 1925.) In the Lancet [Trevan, 1922] a piece of apparatus was described which could be used for the measurement of very small volumes of fluid, 0*01 cc. being measurable by its aid with an accuracy of less than ± 1 %. In a slightly modified form the instrument has found considerable applica¬ tion, especially in the performance of the Ramon test for diphtheria antitoxin and in microchemical titrations, and it was thought that a description of the new form with some fuller details of the uses to which it has been put would be of interest. The principle of the instrument depends on the accuracy with which a fairly well-fitting piston of a glass syringe will displace a volume of fluid, the displacement being produced and measured by a Starret micrometer head such as may be obtained at any engineer’s tool shop. Since the original paper was written, it has been discovered that a syringe driven by a screw had been used by both Kelvin and Lister, by the former for measuring re¬ latively large volumes of gas in the constant pressure gas thermometer, by the latter for measuring small quantities of fluid in bacteriological research. Fig. l. Fig. 1 shows the details. A is the micrometer head; B the holder, and C the syringe. The syringe illustrated is a glass “tuberculin” syringe with the piston oiled with viscous liquid paraffin, but any type of syringe can be used. The holder consists of a piece of steel tubing cut out to shape as illus¬ trated. The end 0 is slotted as illustrated in the plan at F so that there is