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Recueil de travaux offerts par les auteurs à H. A. Lorentz à l'occassion du 25me anniversaire de son doctorat le 11 décembre 1900

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upon tlie pressure at wliich the gas is supplied to the burner. Tn the

Fig. 1.

tirst, we have two separate cylindrieal jets of sinall size (Fig. 1«) wliich, witli iucreasing gas pressure meet without uniting; eaeh being deflected,

bv ii>i])iiigiug upon the otlier, into a vertical |)lane (Fig. 1 b). At slill higher pressures the aetual uuion of tlie two jets takes place, giving tlie flame tlie structure sliowu iu (Fig. Ie), in wliich the two cylin¬

drieal jets of gas in the process of coinbustion unite to fonn a single flat vein or euvelope wliich constitutes the luminous portion of the flame. VVlien tliis third stage is reached, tliere is great stability of fonn and position. Suc.li a flame responds with a sharp latend inotion to air waves sucli as are produced by the slamming of ;i door, hut is comparatively unalfectedby slight drafts. Even in a room not essentially free froni air curreiits the lateral motions of tlie flame, wliich may be accurately observed bv throwing an enlarged image of it, vicwed edgewise, upon ascreen, rarely amount toinorethan .1 mm. and in an especially protected

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Fig. 2