Applied bacteriology; an introductory handbook for the use of students, medical officers of health, analysts and sanitarians / by T.H. Pearmain and C.G. Moor.

  • Moor, C. G. (Cresacre George)
Date:
1898
Catalogue details

Licence: Public Domain Mark

Credit: Applied bacteriology; an introductory handbook for the use of students, medical officers of health, analysts and sanitarians / by T.H. Pearmain and C.G. Moor. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    the left-hand back top corner of the apparatus, is a small metallic hermetically-sealed capsule, which contains a few drops of a liquid having a boiling-point at or near the temperature which we wish to maintain the heated chamber. The capsule lies in a little holder suspended below the tube, through which the needle under the screw P (Fig. 7 and Fig. 8) passes. Soldered to the upper side of the capsule is a thick piece of metal, having a central depression. In this depression the lower end of the needle seen in Fig. 8 rests, and the upper end of the needle enters a short distance into the Fig. 7.—Excelsior Gas-valve. socket end of the screw P. Communication is thus estab- lished between the capsule inside and the Excelsior gas- valve outside. Above is shown an enlarged view of the gas-valve seen in Fig. 7. A is the inlet for gas. C, the outlet to burner. BD, a lever pivoted to standards at G, and acted upon by the capsule through the needle which enters the socket below the screw P. The construction of the acting portion of this valve is such that, whenever the end B of the lever BD presses on the disc below the end B, the main supply of gas is enthrely cut off. At such times, however, a very small portion of