...mirrors wr re placed at thccUftance of about twenty-five yard« one from the other, in ordei to deteimine whether the time of the propagation of the radiant heat, from one focus to the other, could b» appreciated. A heated, but not luminous, ball, was fufpended at one of the foci, before which a...

...that inftant The two mirrors were placed at the diftance of about twenty-five yards from one another, in order to determine -whether the time of the propagation...ball, was fufpended at one of the foci, before which a fcreen was placed. At the inilant that this obftacle was removed, the fluid in the thermometer, . which...

...heat, stopped that instant. The two mirrors were placed at the distance of about twenty-five yard* one from the other, in order to determine whether the time of the propagation of the radiant hear, from one focus to the other, could be appreciated. A heated, but not luminous ball, xvas suspended...

...two mirrors were placed at the diflance of about twenty-five yards one from the other, in order tQ determine whether the time of the propagation of the...from one focus to the other, could be appreciated. A healed, but noc luminous ball, was fufpended at one of the foci, before which a fereen was placed....

...heat, ftopped that inftant. The two mirrors were placed at thediltance of abuut twenty-five yard» one from the other, in order to determine whether...the radiant heat, from one focus to the other, could bt appreciated. A heated, but n-it luminous, ball, was fufpended at one of, t he loci, before which...