376 
MESSRS. W. E. AYRTON AND H. KILGOUR ON THE 
deep in the end of the bar (fig-. 5) inserting the end of the wire to be tested into the 
cut and gently hammering the copper so as to grip the wire. The copper was then 
heated in a blowpipe, and solder having a higher melting point than 350° C., run in 
so as to fill up all interstices. 
Fig. 5. 
These copper bars, B, B (fig. 6), dipped into oil contained in an iron pot P P 
wrapped round with asbestos cloth to prevent loss of heat, and were supported from a 
Fig. 6. 
wooden cross-piece W W, which carried the thermometer T T, the guide G G for 
the stirrer S S, and itself guided the handle H PI of the stirrer, the up and down 
motion of which was limited by two pins. 
Four thermometers of different ranges were used in these tests, and each of them 
