36 Mr. J. Burgess on the Measurement of Altitudes 



Table I. — Logarithms of the Barometrical Pressures in inches 

 of Mercury, with the Altitudes in feet, corresponding to Boil- 

 ing-points between 176° and 215° F. 



T. 



LogB. 



Differ- 



Heights 



Differ- 



T. 



Log B. 



Differ- 



Heights 



Differ- 







cnces. 



in feet. 



ences. 







ences. 



in feet. 



ences. 



o 



176 



1-145960 



9780 



19992 



590 



196 



1-335056 



9109 



8576 



550 



177 



155740 



9745 



19402 



589 



197 



3441651 9077 



8026 



548 



178 



165485 



9709 



18813 



586 



198 



353242 9046 



7478 



546 



179 



175194 



9674 



18227 



584 



199 



362288 9015 



6932 



544 



180 



184868 



9640 



17643 



582 



200 



371303 



8984 



6388 



542 



181 



194508 



9604 



17081 



580 



201 



380287 



8953 



5846 



541 



182 



204112 



9571 



16481 



578 



202 



389240 



8923 



5305 



538 



183 



213683 



9536 



15904 



576 



203 



398163 



8892 



4767 



537 



184 



223219 



9502 



15328 



574 



204 



407055 



8862 



4230 



535 



185 



232721 



9469 



14754 



571 



205 



415917 



8832 



3695 



533 



186 



1-242190 



9435 



14183 



570 



206 



1-42474 9 



8802 



3162 



532 



187 



251625 



9401 



13613 



568 



207 



433551 



8773 



2630 



529 



188 



261026 



9368 



13045 



565 



208 



442324 



8743 



2101 



528 



189 



270394 



9335 



12480 



564 



209 



451067 



8714 



1573 



526 



190 



279729 



9302 



11916 



561 



210 



459781 



8684 



1047 



524 



191 



289031 



9270 



11355 



560 



211 



468465 



8656 



523 



523 



192 



298301 



9237 



10795 



557 



212 



477121 



8628 







521 



193 



307538 



9205 



10238 



556 



213 



485749 



8598 



- 521 



519 



194 



316742 



9173 



9682 



554 



214 



494347 



8571 



-1040 



517 



195 



325915 



9141 



9128 



552 



215 



502918 





-1557 





Table II. 





Multiplier. 









Multiplier. 





Differ- 









Differ- 



t+? 









Difference 



Log A. 



ence 





Difference 



Log A, 



ence 



Fahr. 



fori 

 = •00205. 





for 1°. 



Fahr. 



fori 

 =0-0205. 





for 1°. 



10 



0-95744 



4-76193 



93 







52 



104350 



4-79931 



85 



12 



•96154 



•76378 



92 



54 



•04760 



•80101 



85 



14 



•96564 



•76563 



92 



56 



•05170 



•80271 



85 



16 



•96973 



•76747 



92 



58 



•05580 



•80440 



84 



18 



•97383 



•76930 



91 



60 



1-05990 



4-80608 



84 



20 



0-97793 



4-77112 



91 



62 



•06400 



•80776 



84 



22 



•98203 



•77294 



90 



64 



•06810 



•80943 



83 



24 



•98662 



•77475 



90 



66 



•07220 



•81109 



83 



26 



•99022 



•77655 



90 



68 



•07630 



•81275 



83 



28 



•99432 



•77834 



89 











70 



72 



1-08040 

 •08450 



4-81440 

 •81604 



82 

 82 



30 



0-99842 



4-78013 



89 



32 



1-00252 



•78191 



89 



74 



•08860 



•81768 



82 



34 



•00662 



•78368 



88 



76 



•09270 



•81932 



81 



36 



•01071 



•78544 



88 



78 



•09680 



•82094 



81 



38 



•01481 



•78720 



88 



80 



1-10090 



4-82256 



81 



40 



1-01891 



4-7881)5 



87 



82 



•10500 



•82418 



80 



42 



•02301 



•79070 



87 



84 



•10910 



•82579 



80 



44 



•02/11 



•79243 



87 



86 



•11320 



•82739 



80 



4e> 



•03121 



•79416 



86 



88 



•11730 



•82898 



80 



48 



•03531 



•79588 



86 



90 



1-12140 



4-83058 



79 



50 



1-03940 



4-79760 



85 



92 



•12550 



•83216 



79 



52 



•04350 



•79931 



85 



94 









