﻿(A) 



Apparent lcnf;th of the bafe meafurcd and computed 393,3282212 chains equal - - - -- - - -. 



Sum of all th;- drdiirtioiis in column 5, --......-.... 



Sum of the didutlions in column 6, ^j-. ........ .- 



1 hen if ihe chaui was compared with the brafs flandard, and meafured loo feet at the temperature of 62" and the mean temperature of meafurement being 83.5 ver^ nearly, the 



corrcclion for the chain's expahfion will be=:83,5 — 62' X ,0073 



71 "X 39332,822 feet nearly, which add - - - . - - • -_ 



Therefore the true length of the bafe in the temperature of 62° will be .......... 



Whichbcingrcduccdtothelevelofthefea, by allowing the height above Marfrtff to be S901 feet, will.be ....... 



Feef. 



39332,82218 



— 5,4127.3 



— 59.30C97 



39-.^.253 

 39967,700 



(A) We w'U firft fuppoie, that, when a fteel chain is meafured off, in any given temperature, by the ftandard brafs fcde. there is a coincidence of meafure : that is, that IQO feet of fteel Ihall 1 

 v.th 100 feet of brafs. And this teinperature, bcicg denoted by the degrees oa Ujfi thettuouieur^ IhaU mU the /.»'/..r«<«r« ^""'"^^^^^^ 



aincide 



