Fermentation organisms : a laboratory handbook / by Alb. Klöcker; translated from the german by G. E. Allan and J. H. Millar.

Date:
1903
Catalogue details

Licence: In copyright

Credit: Fermentation organisms : a laboratory handbook / by Alb. Klöcker; translated from the german by G. E. Allan and J. H. Millar. 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.

    69/458 (page 45)
    side there is an inlet for the water, and on the opposite side an outlet. Near the inlet there are also perforations tor reiTulator and thermometer. In the lid there are, in addition, two openings, one for a thermometer which pro- jects into the interior of the space in which the cultures are placed, the other acting as ventilator. Tap water is used for obtaining the desired temperature, its temperature being generally lower than 15° C. The water passes from the taj) through a tube to a small constant-level cistern, and from there through another tube to the regulator (see page 49). Pfeiffer’s Microscope Heating Apparatus.—When it is desired to follow out the development of a micro-organism at a certain constant temperature under the microscope, this can be done by using the small thermostat designed by L. Pfeiffer, which is shown in Fig. 17. The arrangement consists of a mahogany box, which completely surrounds the stand, and which is almost air- tight when closed. Its front wall has a glass window to admit sufficient light for observation; the left and right walls (seen from the observer) have each a well-fitting fiap door so that the preparation may be manipulated. In order to make the microscope freely accessible, the side walls are capable of being complete]}^ removed along with the halves of the back wall, which is divided down the middle. The whole stands on a thick metal plate with three metal feet. The heating is effected by warming the plate from below by means of a micro-burner, the gas supply of which is controlled by a regulator. Experiments made in the Carlsberg laboratory have shown that the Reichert regulator described below is very suitable for this apparatus. With the side flaps opened or closed the greatest variation of temperature in the apparatus at 25° C. or 32° C. was only 1°, If the apparatus is closed and then the flaps suddenly opened, the temperature falls about