 | International Correspondence Schools - 1900 - 614 pàgines
...to be air-tight. As long as the hemispheres contain air, they can be separated with no difficulty; but when the air in the interior is pumped out by means of an FIG. 122. air pump, they can be separated only with great difficulty. The force required to separate... | |
 | Walton Martin, William Hayden Rockwell - 1900 - 432 pàgines
...edges fit tightly and are well greased. One of them has a stop-cock for attachment to the air-pump. As long as the hemispheres contain air they can be separated without difficulty, for the external ..itmospheric pressure is counterbalanced by the elastic force of the... | |
 | International Correspondence Schools - 1900 - 860 pàgines
...be screwed on an air-pump. The edges fit accurately and are well greased, ! so as to be air-tight. As long as the hemispheres contain air, they can be separated without trouble; but when the air in the interior is pumped out by means of an air-pump, they can be separated... | |
 | 1902 - 544 pàgines
...greased, so as to be air-tight. As long as the hemispheres contain air, they can be separated with ease ; but when the air in the interior is pumped out by means of an air pump, they can be separated only with great difficulty. The force required to separate them... | |
 | William Rogers - 1905 - 458 pàgines
...One of the hemispheres is provided with a stop-cock, by which it can be screwed on to the air-pump, and on the other there is a handle. As long as the...the air in the interior is pumped out by means of an air-pump, the hemispheres cannot be separated without a powerful effort. The Barometer is an instrument... | |
 | Adolphe Ganot - 1905 - 802 pàgines
...provided with a stopcock and a short neck, by Fig. 1 1 8. which it can be screwed on the air-pump, and on the other there is a handle. As long as the...pressure of the atmosphere is counterbalanced by the pressure of the air in the interior. But when the air in the interior is pumped out by means of the... | |
 | 1905 - 696 pàgines
...can be screwed on an air-pump. The edges fit accurately and are well greased, so as to be air-tight. As long as the hemispheres contain air, they can be separated without trouble; but when the air in the interior is pumped out by means of an air-pump, they can be separated... | |
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Fig. 91. diameter, the edges of which are made to fit tightly, and are well greased. One of the hemispheres is provided with a stopcock, by which it can be screwed on the air-pump, and on the other there is a handle. As long as the hemispheres contain... 
