Bauhaus-Universität Weimar

is lined with felt, so that it closes hermetically and the heat is well insulated. If it is not necessary to illuminate the interior of 
the chamber a felt shade is placed in front of the door, which is covered with oil cloth. 
The other parts of the heating chamber are completely surrounded by the water compartment W, the sides of which are 
about 2'/a cms. apart. The inner side consists of corrugated metal, so that the largest possible heating surface is obtained. 
The compartment is filled through the little pipe (a) at the top. It must be filled either with distilled or with rain water, and ns 
soon as it is full the water begins to overflow through the opening (r) in the side. Before being filled in the water should be 
heated to a temperature about 10° higher than the temperature required in the heating chamber. By this means the latter is attained 
almost immediately. The water is let off through the little pipe (r*) in the side of the compartment, near the bottom. This pipe 
is closed by means of a cork. 
The compartment X, which surrounds the water compartment described above, contains a layer of some good insulating 
material, about 5 cms. thick. The inner side of this insulating layer assumes and retains the temperature of the water, and 
thereby currents in the fluid are avoided, which whonld otherwise be caused by the sides of the compartment becoming cooler. When 
the required temperature has once been attained in the apparatus, the very slight currents in the water which are caused by heating 
the bottom of the water compartment with hot air are of no consequence, as they counteract each other immediately. 
The heating arrangement consists firstly of the long pipe CC, which is bent into the shape of a U, and runs along the 
bottom of the water compartment, inside same. The metal box M is screwed, by means of two joints, to the two open ends of this 
pipe and thus fixed to the side of the apparatus. Perpendicularly through tins box, which contains a thick layer of insulating 
material, passes the metal chimney SS. When a petroleum lamp is used for heating, same is placed in such a manner benatli the 
box that its chimney reaches just up to the above mentioned metal chimney. Where a Bunsen gasflamme or Bunsen spiritlamp, or 
a benzoline lamp represents the means of heating, the flame must ascend right into the metal chimney. 
The selfacting temperature regulating device „Simplex“ is constructed as follows: The cylinder K contains a drum which 
is so constructed, that an increase or decrease of its volume, when caused by a change of temperature, can only, take place and 
manifest itself in the rising or sinking of its upper convex surface, this consisting of a very thin and elastic metal leaf, which is 
very sensitive to a change of temperature. The movements of this metal leaf are transmitted to the lever (h) on the top of the 
apparatus. Close to the fulcrum of this lever and passing through the latter, there is au adjusting screw Ci), the point of which 
rests on a shaft, which latter in turn rests in a conical dent in the centre of the upper surface of the drum. Bv turning the 
adjusting screw the distance between the lever and the drum can be regulated. At. the other end of the lever (h) there is a chain, 
which hangs down perpendicularly and has attached to its lower end the cover (d). The cover must hang so, as to be close above 
the top of the metal chimney. There are three metal teeth, about 1 cm long, round the edge of the cover, to prevent it from 
falling into the chimney. When the lever siifks, that is. when the temperature becomes cooler, the cover sinks too and closes the 
chimney, consequently the hot air is forced to enter pipe CO and raises the temperature of the water surrounding the pipe. When 
the temperature rises the cover is uaturally lifted off the top of the chimney and the hot air escapes. 
In order to be able to regulate closely the temperature, which is indicated on the thermometer (t) to 1/5° Celsius, the 
running weight (g) is provided. When the thermometer indicates the required temperature, the weight is placed in such a position 
that the cover just touches the top of metal chimney. If after some time it is found that the temperature has increased considerably, 
the adjusting screw is turned slightly, if the increase of temperature is only small, the running weight (g) is moved a little towards 
the fulcrum of the lever; both actions have the effect of raising the cover from the top of the chimney. The reverse is done, of 
course, if the temperature is too^ low. Two drums are supplied with each apparatus free of charge, while each further one required 
is charged for at the rate of 3'jo Marks. They can easily be taken out and replaced, and are so constructed that each one will 
regulate the temperature within 10° Celsius, i. e. between 20 and 30°, between 30 and 40° and so on. The highest temperature 
for which the apparatus has hitherto been constructed is 70° Celsius. 
The Germania regulating device, 
D. R G. M- No. 6444ft — British Patent No- 8841 — Belgian Patent No. 126244 
is constructed to regulate the temperature within'much closer limits. It consists mainly of the ball (b), which is balanced on hard 
pointed screws and connected with rod (f) by shaft (g). The regulating is done by means of screw (a) at the end of pipe (r), which 
latter is connected with rod (f) and through which shaft (g) passes. No change is necessary in the device, as it will regulate any 
temperature between 20 and 70° Celsius. 
The apparatus further contains an arrangement for ventilating with moist, air. For this purpose there is at the bottom 
of the heating compartment a conduit (u), longer than it is deep aud running parallel with the glass door,- which passes through 
compartments W and X. At the top there are two conduits, of equal size, one just behind the glass door, the other opposite the 
first at the back of the apparatus. The lower openings of these conduits are in the shape of slits. These conduits pass in slanting 
direction through the water and insulating compartments till they meet near the centre of the top of the apparatus. Their combined 
opening at this end is octangular, but of the same size as the two lower openings would be if combined. Over the openig at the 
top there are two perforated metal plates, of which one can be pushed over the other in such a way, that either the holes“iu both 
are opposite each other and allow air to pass through, or they are not and close the conduits. When moist ventilation is required 
the box (dd), in which wet linen has been spread out, is pushed in at the side of the apparatus. The water required to keep the 
linen wet is contained in the „Erlenmeyer“ flask (b) at the side of the apparatus, from where it trickles in the desired quantities 
into the box. 
Whatever heating method is used in connection with the apparatus, it is important that the quantity of heat should always 
be sufficient; it is even desirable that a little more heat is generated than is actually necessary to produce the temperature desired 
in the heating chamber, as neither a too large flame nor the fluctuating pressure of gas have any effect upon the temperature in 
the chamber. 
JTouvelle Etuve de Sartorius 
à combustible quelconque pour l'incubation (le bacilles, bactéries et pour la culture de préparations 
microscopiques dans la paraffine. 
décrite par Mr. le Dr. Koch à Goettinguo, dans la „Rovue périodique de la Microscopie scientifique", volume X, fascicule 2, et par Mr. le Dr. Hans 
Uoichonbach à Ooettin guo, dans la „Fouille eontralo pour la bactériologie et la Science des Parasites", volume XV, No. 22, et dans la „Revuo 
périodique de la Science des Instruments“ 1S94, fascicule 2. 
L’espace intérieur de l’appareil représente une étuve dont le dessin ci-joint montre la forme. Suivant la dimension des 
récipients qu’on y vont placer, cette étuve peut être divisée eu un ou plusieurs compartiments au moyen de plaques en tôle 


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