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Bog, hæftet The Pentane Lamp as a Working Standard (Classic Reprint) af E. C. Crittenden

The Pentane Lamp as a Working Standard (Classic Reprint)

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Excerpt from The Pentane Lamp as a Working Standard

Since all ¿ames depend upon combustion it is to be expected that their intensity will vary with the proportion of oxygen and of other constituents in the air supplied to the gaseous fuel of the ¿ame. T O maintain a ¿ame in a... Læs mere

Excerpt from The Pentane Lamp as a Working Standard

Since all ¿ames depend upon combustion it is to be expected that their intensity will var... Læs mere

Produktdetaljer:

Sprog:
Engelsk
ISBN-13:
9781333932565
Sideantal:
32
Udgivet:
01-10-2016
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Excerpt from The Pentane Lamp as a Working Standard

Since all ¿ames depend upon combustion it is to be expected that their intensity will vary with the proportion of oxygen and of other constituents in the air supplied to the gaseous fuel of the ¿ame. T O maintain a ¿ame in a constant condition requires, therefore, not only uniform fuel, but also a uniform proportion of oxygen in the air supplied to the ¿ame. Good ventilation is con sequently desirable for all work with ¿ames, and is indispensable where lamps of other kinds are to be compared with a ¿ame standard. The quantity Of air which must be supplied depends largely on the size and number Of ¿ames in the room and also on the method Of ventilating. The ¿ames themselves set up currents of air, and if possible these currents should be utilized to remove immediately from the room all the vitiated air coming from the lamps. A hood placed above the photometer with a rising pipe to lead the warm air out of the room is most effective.

If the gases from the ¿ames are allowed to diffuse into the room and are simply diluted by the air entering, a much larger amount Of fresh air will be needed. In such a case it has been estimated 5 that to keep the carbon dioxide content of the air down to 6 parts in IO 000, cubic feet of fresh air per hour must be supplied for each person in a room. A committee Of the American Gas Institute 6 has on this basis estimated that 36 900 cubic feet Of air per hour should be supplied for a photometer room where two persons work with a pentane lamp and a 5-foot gas ¿ame, Since in the production of carbon dioxide the gas ¿ame is approximately equivalent to six persons and the pentane lamp to four.

In a room where air enters at the bottom and escapes at or near the top the quantity estimated as above (about I 2 000 cubic feet per hour for a pentane lamp) is probably ample for any purpose, and if care is taken to allow direct escape Of the ¿ame gases a much smaller amount is sufficient.

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This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

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