A true$-$fuid manometer such as shown in the Fig is to be used to measure large pressure diferences Assuming that the sarme liquid is in the kegs with $r_1=r_2=62\mathrm{.}4l\frac{b}{f}{t}^3$ Waterl and that the manameter fiuid is mercury $)=(850l\frac{b}{f}{t}^3$ determine the pressure diference between A and $8$ if $y$ is equal to $1ft$ and

$($G$)$ A and $B$ are ar the same level.

$($b$)A$ is E inches righer thar $B($Ren S$4$i pu$,525$ pol$)$