ON THE MERIDIAN. m 



At the commencement, the old chain exceeded the new 



one 29.86 divisions of the micrometer, equal to ,01188 feet 

 Therefore 305x100.01188 feet, will be the' measure in Feet, 



terms of the new chain ---------.- ^30503.6243 



At the conclusion, the old chain exceeded the new one 

 39.04 divisions, and had therefore increased 9.38 divisions^ 



©qua! to .00376 feet, Hence 305 x^p— 0.5731 ftfSfc the 



correction for the wear,, which add -------- -j- ©.5731 



The sum of the deductions from col. 4th is 0.35406 

 feet, which being increased in the ratio of 100 to 100.0118S 

 will be .35410 feet, which subtract .= -=> = -=>- .— . ©.3541 



Hence the apparent horizontal distance will be = * - 30503.8433 



The corre6tion for the expansion and reduced to the stan- 

 dard temperature of 62°. will be fe^>g^^y^ 

 : XSO503.8433 feet, which add --.------»-}- 4.2965 



Hence, the corrected measure of the Base, for the tem- 

 perature of 62 °. will be .-■-■. -.,'-:*-' - ^'" ; v -• > - — 30508.1398 



Which being reduced to the level of the sea s by taking 

 the mean height of the Base, and which is 435.86 feet 

 above the level ©£ the sea ; will be - - - - - - - 30507.5 



