Clanny Lamp. – The Clanny lamp (see Fig. 351) is similar to the Davy, but there is a glass cylinder instead of the lower portion of the gauze. The glass cylinder has a washer of soft leather, indiarubber, asbestos, or other flexible material at the top or bottom, so as to prevent a passage of air over it. A flange at the bottom of the gauze cap fits against a brass ring over the glass; the supply of air for the lamp enters through the gauze above the glass. The Clanny gives more light than the Davy, and can be more easily carried in an air-current without being blown out; it is superior in no other respect, whilst, if an explosion should take place inside, the burning gases, having a less area of gauze through which to escape in proportion to the contents of the lamp, would be more likely to fire the gas outside than in the Davy lamp. Such an explosion of gas inside a Clanny could, however, only take place if there was a very small oil-flame inside the lamp, permitting the lamp to be nearly filled with explosive mixture. If, on the other hand, the flame of the lamp was at its full height, a great part of the interior would be filled with the products of combustion from the lamp-flame, and therefore there would only be room for a small quantity of explosive gas. Therefore, if the Clanny lamp is used for testing for gas, it is in the first instance desirable to use it with the flame at full height; if this gives no indication of gas, then the flame may be reduced, and a more delicate test applied.