248 Sir G. 13. Airy on the Construction and Use of a 



depth of a cylinder be measured by the engraved numerals on 

 the depth-scale, and the diameter by the engraved numerals 

 on the diameter-scale, the sum of the measures will be 10 for 

 half-gill, 20 for gill, 30 for half-pint, 40 for pint, &c. 



As the zero-end of the scale is always to be brought to con- 

 tact with the bottom or with the interior of the circle, that 

 end ought to be hard ; in other respects the scale may be a 

 very light rod. If the bottom of the measure is spherical, the 

 measure of depth to be adopted is the mean of those taken ; 

 one with the zero-end of the scale resting on the centre, and 

 the other close to the circumference. 



The following numbers have been computed for the gra- 

 duations of the scales — using for a, 2*321, and for b, 12*315. 



Measures, in Inches, for the Graduations of the Scale for 

 Depths. 



Numeral. 



Measure, 

 in inches. 



Numeral. 



Measure, 

 in inches. 



Numeral. 



[Measure, 

 In inches. 



Numeral. 



Measure, 

 in inches. 



2 



1-349 



24-8 



6-551 



32-4 



11-094 



37-4 



15-690 



3 



1-446 



25-0 



6-643 



32-6 



11-249 



37-5 



15-799 



4 



1-550 



25-2 



6-735 



j 32-8 



11-406 



37-6 



15-909 



5 



1 661 



25-4 



6-829 



1 330 



11-566 



37-7 



16-020 



6 



1-780 



25-6 



6-925 



j 33-2 



11-728 ! 



37-8 



16-131 



7 



1-908 



25-8 



7-022 



1 33-4 



11-891 : 



379 



16-244 



8 



2045 



26-0 



7-120 



33-6 



12-057 : 



380 



16-357 



9 



2-191 



26-2 



7-219 



! 33-8 



12-225 ; 



38-1 



16-471 



10 



2-349 



26-4 



7-320 



34-0 



12-396 



38-2 



16-586 



11 



2-517 



1 26-6 



7-422 



34-2 



12.569 



38-3 



16701 



12 



2-698 



26-8 



7-526 



34-4 



12-744 



38-4 



16-817 



13 



2-892 



1 27-0 



7-631 



34-6 



12-922 



38-5 



16-934 



14 



3-099 



27-2 



7-737 



34-8 



13-103 



38-6 



17051 



150 



3-321 



27-4 



7-845 



i 35-0 



13-286 j 



38-7 



17-169 



15-5 



3-438 



I 27-6 



7-954 



! 351 



13-378 



38-8 



17-289 



16-0 



3-560 



! 27-8 



8-065 



! 35-2 



13-471 



389 



17-410 



165 



3-685 



28-0 



8-178 



35-3 



13-565 



390 



17-531 



170 



3-815 



28-2 



8-292 



! 35-4 



13-659 



39-1 



17 653 



175 



3-950 



28-4 



8-408 



I 35-5 



13-754 



39-2 



17-775 



180 



4-089 



28-6 



8-525 



j 35-6 



13-849 



39 3 



17-898 



18o 



4-233 



28-8 



8(544 



j 35-7 



13-945 



39-4 



18-022 



190 



4-383 



290 



8-765 



35-8 



14-042 



39-5 



18-147 



19-5 



4-537 



29-2 



8-887 



35-9 



14141 



396 



18-274 



200 



4-697 



29-4 



9-011 



360 



14-240 



39-7 



18-401 



20-5 



4-863 



29 6 



9-137 



36-1 



14-339 



39-8 



18-529 



210 



5-034 



298 



9-265 



36-2 



14-438 



39-9 



18-658 



21-5 



5-212 



300 



9-395 



36-3 



14-538 



400 



18-789 



22-0 



5-396 



30-2 



9-526 



36-4 



14-639 



401 



18-920 



225 



5-586 



30-4 



9658 



3(5-5 



14-741 



40-2 



19-051 



23-0 



5-7S3 



30-6 



9-792 



36-6 



14-843 



40-3 



19183 



232 



5-863 



30-8 



9-929 



36-7 



14-946 



404 



19-316 



234 



5-945 



31-0 



10-069 



36-8 



15-050 



405 



19-450 



23-6 



6028 



31-2 



10209 



36-9 



15-156 



406 



19-586 



238 



6-112 



31-4 



10-351 



37-0 



15-262 



40-7 



19-723 



24-0 



6-198 



31-6 



10-496 



o-.i 

 61 1 



15-368 



40-8 



19 860 



242 



6-284 



31-8 



10643 



372 



15-475 



40-9 



19998 



24-4 



6-372 



320 



10-792 



373 



15-582 



410 



20-137 



21-6 



6-461 : 



32-2 



10-942 







1 





