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ABSiHACTS AND REVIEWS 281 mounted centrally within the racking at each level. The effect of varying the numbers of sprinklers per pallet cell, the use of each and alternate sprinkler levels and the size of the sprinklers (10 or 15 mm bore) on the development of the fires was studied. This arrangement was found to give good general protection to the racking and goods, in that the fire would have been contamed and subdued, but in all but one experiment the fire spread throughout the height of the racking. Lateral spread was restricted to the width of the cell of origm. Automatic detection eqmpment was found to operate about two minutes before the operation of the first sprinkler. The operation of the sprinklers caused the production of a certain amount of cool smoke which sank to ground level Corrie, J . G. and Griffiths, D. J . (Joint Fire Research Orgamzation, Boreham Wood, England) "Extmction of Laboratory Hydrocarbon Fires with a Syn- thetic Foam," Joint Fire Research Organization Fire Research Note No 894 (October 1971) Section: E Subjects: Extinction, hydrocarbon fires, Foam tests Authors' Summary The extinction performance of a proprietary synthetic foam liquid, normally used for the production of high expansion foams, has been measured on 0 279 m* petrol fires, the foam bemg apphed with expansion of about 10 at a rate of 0 04 l/m'/s. Control time was found to be a function of expansion as well as of shear stress. With optimum foam characteristics, control time was equal to that obtained with fluorochemical foams, and superior to all other types of foam which have been tested Under the test conditions used, best results were obtamed at an expansion of 12 and a shear stress close to 10 N/m*.
