| Show WHAT is 18 FIRE Boer haave distinguished fire into two kinds elem entry eutry fire as it is in itself and culinary fire as joined with other bodies ad excited by the former kind of fire in combustible matter according to him the first effect of elementary ele eie elementary mentar gire firel is sheat heat heat is I 1 inseparable n e par able abie from fire rae yae the measure of heat is a always aw as the measure of fire and that of fire of heat ea t the second effect of elementary fire is the dilation of all solid bodies and the catiti ratification of all fluids on cooling again it contracts and return returns s successively through all the degrees of its dilatation till it arrives at its first bulk being 0 never of the same magnitude i two m minutes on utes on successively ly gold when fused take takes 9 up more space than before mercury placed priced in a narrow tube over the ibe gire fre will ascend to 30 times its former height A f in ia a severe win winter terla day ve e rub a plate of gold briskly against another t her gold plate they will bo both boeh th gradually grow hotter and and b hotter oti te r u until in til ill at length they become red hot and at the ohp point of melting and yet all this time the plates lates lose nothing of their weight but swell e F I 1 and grow bigger in all their dimensions hence it follows that the particles of the gold have not converted the friction into fire the fire existed before and all the effect of the friction is to collect and bring together a quantity quan ay iy thereof hereof I 1 before dispersed throughout I 1 the atmosphere there is no making or producing of fire de nono noco all we can do is it if insensible to render it sensible to collect it out of a greater space into a lesser and to direct and determine it to certain P places laces mil mii the year round bound |
