| Reference number | PP/20/28 |
| Previous numbers | PP/52/29 |
| Level | File |
| Title | Paper, 'A new portable miner's safety-lamp, with hydrogen attachment for delicate gas-testing; with exact measurements of flame-cap indications furnished by this and other testing lamps' by Frank Clowes |
| Creator | Clowes; Frank (d 1923); British chemist |
| Date | 1893 |
| Description | Clowes writes: 'The presence of firedamp is still almost invariably detected, and its amount is more or less accurately measured, by the observation of the pale blue “cap” produced by the “gas” over the flame of the safety-lamp. By suitably reducing the flame of an ordinary oil safety-lamp by drawing down the wick, it is generally considered that percentages of gas in the air varying from about 2.5 to 6 can be detected and estimated.'
Annotations in pencil and ink. Includes two pages of diagrams and photographs of experimental apparatus and results.
Subject: Scientific apparatus and instruments
Received 10 January 1893 / 12 January 1893. Read 2 February 1893. Communicated by [Henry Edward] Armstrong.
A version of this paper was published in volume 52 of the Proceedings of the Royal Society as 'A new portable miner's safety-lamp, with hydrogen attachment for delicate gas-testing; with exact measurements of flame-cap indications furnished by this and other testing lamps'. |
| Extent | 18p |
| Format | Manuscript |
| Diagram |
| Physical description | Ink and graphite pencil on paper |
| Digital images | View item on Science in the Making |
| Access status | Open |
| Related material | DOI: 10.1098/rspl.1892.0092 |
Fellows associated with this archive
| Code | Name | Dates |
| NA8105 | Armstrong; Henry Edward (1848 - 1937); chemist and educationalist | 1848 - 1937 |