Text Appearing Before Image: down the tube, only to reappearat the top a little later. The pump next tried was the Gaede rotary mercury purap^.See Plate I, Fig. 1. When this pump was attached to the 500 cc.McLeod gauge with a preliminary exhaustion of 1.8 cm. produced by amotor driven Geryk, the following readings were taken. Table I. Time pressure tube volume tube pressure 10:00 1.8 cm. a.m. 10:01 21.4 cm. 0.053 cc. 0.26 mm. 10:03 - 0.02 10:06 9.2 0.03 0.006 10:15 15.0 0.01 0.003 10:50 11.0 0.01 0.0022 11:50 1.7 0.01 0.0017 The system was left standing until 5:00 p.m. to test for leaks. The reading showed a small increase in the pressure, which might have been due to gas given out by the walls of the gauge, or to a leak. At 5:30 p.m. pumping was continued as indicated in table II. Table II. Time pressure tube volume tube pressure 5:30 11.0 cm. 0,01 cc. 0.0022 mm. p.m. 5:32 3.0 0.01 0.0006 5:35 2.5 0.01 0.0005 5:38 2.2 0.01 0.00044 5:42 2.0 0.01 0.0004 .1 Phys. Zeitschr. , vol. 6, pp. 758-760, November 9, 1 905. Text Appearing After Image: 4 Although pumping was continued for more than an hour, therewas no change in the degree of exhaustion. Probably the rate of ex-haustion was offset by the rate of leak, and by the gas that wasgiven off from the walls of the vessel where it had condensed. Thesystem was left until 7.00 next morning, when the pressure was 0.004mm., a change that indicates a leak. This difference (0.0036 mm.)divided by the time gives a leak of 0,000004 mm. per minute for theinterval. The rate of leak may have been slowly increasing, for dur-ing the next two hours it figured 0.00003 mm. per minute. The onlyseals in the system were those in the manometer portion of the Gaedepump. They were ground glass lubricated with vaseline. At 10.52 a.m. the pump was started again, but for some rea-son the pressure at starting was not recorded. It can be found fromthe rate of leak given. The readings were as follows: Table III. Time pressure tube voliime tube pressure10.52 10.54 11.5 cm. 0.01 cc. 0.00023 mm. 10.58 8.0 0
Note About Images
Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.
The categories of this image need checking. You can do sohere.
Please remove redundant categories and try to put this image in the most specific category/categories.
You can remove this template by clicking here (or on the first line).
Licensing
This image was taken from Flickr's The Commons. The uploading organization may have various reasons for determining that no known copyright restrictions exist, such as:
The copyright is in the public domain because it has expired;
The copyright was injected into the public domain for other reasons, such as failure to adhere to required formalities or conditions;
The institution owns the copyright but is not interested in exercising control; or
The institution has legal rights sufficient to authorize others to use the work without restrictions.
Please add additional copyright tags to this image if more specific information about copyright status can be determined. See Commons:Licensing for more information.
No known copyright restrictionsNo restrictionshttps://www.flickr.com/commons/usage/false