No CrossRef data available.
We use cookies to distinguish you from other users and to provide you with a better experience on our websites. Close this message to accept cookies or find out how to manage your cookie settings.
We use cookies to distinguish you from other users and to provide you with a better experience on our websites. Close this message to accept cookies or find out how to manage your cookie settings.
Published online by Cambridge University Press: 15 September 2014
The estimation of the percentage of firedamp (methane) present in the atmosphere of a mine is usually performed by observing the height of the flame cap over the lowered flame of a safety lamp. In ordinary circumstances the safety-lamp flame is reduced in size and luminosity to render the cap visible, and the estimation of the amount of inflammable gas is made by observing the height of the cap. It was pointed out by Chesneau (1892) that the visibility of the cap was increased if certain organic chlorides and copper salts were added to the fuel. Also it was shown by Briggs (1912) that strongly coloured caps were obtained if a small quantity of carbon tetrachloride was added to the fuel and a loop of copper inserted in the lamp flame itself.
page 88 note * Phil. Mag., Jan. 1895.
page 88 note † Journ. Phys. Chem., 1914.
page 89 note * Vide Report on Testing for Firedamp, Govt. Memo. No. 10, 1924, p. 15, par. 79Google Scholar.
To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about saving to your Kindle.
Note you can select to save to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.
Find out more about the Kindle Personal Document Service.
To save this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you used this feature, you will be asked to authorise Cambridge Core to connect with your Dropbox account. Find out more about saving content to Dropbox.
To save this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you used this feature, you will be asked to authorise Cambridge Core to connect with your Google Drive account. Find out more about saving content to Google Drive.