LAB DIFFERENTIAL LEVEL LOOP DATA SHEET

These numbers will be used for completion of Module $3\text{'}$s Differential Leveling Lab

Differential Leveling Equation

BM $($ele$)+$ BS $($rr$)=$ HI $($Height of Instrument$)$

$HI-FS(rr)=$ Point Elevation

Step $1$

Instrument $1$ Setup between points $7$ and $8$

Back$-$sight Rod reading $2\mathrm{.}07\text{'}$ on point $7$: add $2\mathrm{.}07\text{'}$ to pt$.7$ elevation of $100\mathrm{.}00$ gives $HI($height of

Instrument$)102\mathrm{.}07\text{'}.$

Fore$-$sight Rod reading $2\mathrm{.}53\text{'}$ on point $8$: subtract $2\mathrm{.}53\text{'}$ from $"HI"102\mathrm{.}07$ gives an elevation of $99\mathrm{.}54\text{'}$

on point $8,$ which is a turning point to continue the loop.

Step $2$

Instrument $2$ Setup between points $8$ and $1$

Back$-$sight Rod reading $3\mathrm{.}53\text{'}$ on point $8$: add $3\mathrm{.}53\text{'}$ to pt$.8$ elevation of $99\mathrm{.}54$ gives $HI($height of

Instrument$)103\mathrm{.}07\text{'}.$

Fore$-$sight Rod reading $4\mathrm{.}26\text{'}$ on point $1$: subtract $4\mathrm{.}26$ from $"HI"103\mathrm{.}07$ gives an elevation of $98\mathrm{.}81\text{'}$ on

point $1,$ which is a turning point to continue the loop.

Step $3$

Instrument $3$ Setup between points $1$ and $2$

Back$-$sight Rod reading $4\mathrm{.}46\text{'}$ on point $1$: add $4\mathrm{.}46\text{'}$ to pt$.1$ elevation of ${98\mathrm{.}81}^{\text{'}}$ gives $HI($height of

Instrument$)103\mathrm{.}27.$

Fore$-$sight Rod reading $3\mathrm{.}66\text{'}$ on point $2$: subtract $3\mathrm{.}66\text{'}$ from $"H{I}^{\text{'}\text{'}}{103\mathrm{.}27}^{\text{'}}$ gives an elevation of $99\mathrm{.}61\text{'}$

on point $2,$ which is a turning point to continue the loop.

Step $4$

Instrument $4$ Setup between points $2$ and $3$

Back$-$sight Rod reading $3\mathrm{.}82\text{'}$ on point $2$: add $3\mathrm{.}82\text{'}$ to pt$.2$ elevation of $99\mathrm{.}61\text{'}$ gives HI $($height of

Instrument$)103\mathrm{.}43\text{'}.$

Fore$-$sight Rod reading $3\mathrm{.}86\text{'}$ on point $3$: subtract $3\mathrm{.}86\text{'}$ from $"HI"103\mathrm{.}43\text{'}$ gives an elevation of $99\mathrm{.}57"$

on point $3,$ which is a turning point to continue the loop.

Step $5$

Instrument $5$ Setup between points $3$ and $4$

Back$-$sight Rod reading ${3\mathrm{.}67}^{\text{'}}$ on point $3$ : add ${3\mathrm{.}67}^{\text{'}}$ to pt$.3$ elevation of ${99\mathrm{.}57}^{\text{'}}$ gives $HI($height of

Instrument$)103\mathrm{.}24\text{'}.$

Fore$-$sight Rod reading $3\mathrm{.}73\text{'}$ on point $4$: subtract $3\mathrm{.}73\text{'}$ from $"HI"103\mathrm{.}24\text{'}$ gives an elevation of $99\mathrm{.}51\text{'}$

on point $4,$ which is a turning point to continue the loop.Lab $3-$ Level Loop Using an Automatic Lavel