Page:Philosophical Transactions of the Royal Society A - Volume 184.djvu/108

Rh under the same conditions, so that the results found at 100° must be accepted. A similar lowering of the rate at 100° was found to occur at low and high pressures.

TEMPERATURE Experiments. H, + 0. Temperature. 10° 100°. Mean rato 2821 2790 H,+ O at 100° C. at different pressures. Pressure. 390 mm. 500 mm. 760 mm. 1000 mm. 1450 mm. Mean rate 2697 2738 2790 2828 2842

When the rates at 100° and varying pressures are compared graphically with the rates found at 10° and varying pressures, it is seen that the two curves run parallel one with the other (see fig. 1 on Plate 1).

The explosion-rates of ethylene and oxygen at 10° C. and 100° C. were also com- pared. Samples of the same mixture were exploded alternately at the low and at the high temperature. Five concordant determinations at 10° C. gave a mean velocity of 2581 metres per second; four concordant determinations at 100° C. gave a mean velocity of 2538 metres per second. Similar experiments were made with cyanogen,

TABLE IX. RATE of Explosion of Ethylene and Oxygen. C,H, + 20%. Temperature. 10° C. 100° C. Mean rate 2581 2538

RATE of Explosion of Cyanogen and Oxygen. CN + 0, Temperature. 10° C. 100° C. Mcan rato 2728 2711