That part of the resistance which is proportional to the load, and on which the value of m in the preceding formulæ depends, is still more variable, and depends so much on the form, magnitude, and the arrangement of its parts, that no general rule can be given for its value. It must, in fact, be determined in every particular case.
In the practical application of the preceding formulæ in condensing engines we shall have [Pg519]
| a = 3875969
b = 164
c = 0·05; |
| e′ = 3875969{ | e | + log. | 1·05 | }. |
| e + 0·05 | e + 0·05 |
In engines which work without condensation, and therefore with high pressure steam, we shall have
| a = 4347826
b = 618
c = 0·05; |
| e′ = 4347826{ | e | + log. | 1·05 | }. |
| e + 0·05 | e + 0·05 |
To facilitate computation, the values of e′ corresponding to all values of e, from e = ·10 to e = ·90, are given in the following table:—
| e | Condensing Engines e′. | Non-condensing Engines e′. | e | Condensing Engines e′. | Non-condensing Engines e′. |
|---|
| ·10 | 10126265 | 11359029 | ·51 | 5966367 | 6692708 |
| ·11 | 9956867 | 11169008 | ·52 | 5903837 | 6622565 |
| ·12 | 9793136 | 10985344 | ·53 | 5842288 | 6553525 |
| ·13 | 9634926 | 10807875 | ·54 | 5781693 | 6485552 |
| ·14 | 9482029 | 10636364 | ·55 | 5722024 | 6418619 |
| ·15 | 9334219 | 10470560 | ·56 | 5663251 | 6352693 |
| ·16 | 9191251 | 10310186 | ·57 | 5605353 | 6287745 |
| ·17 | 9052888 | 10154978 | ·58 | 5548297 | 6223742 |
| ·18 | 8918896 | 10004675 | ·59 | 5492064 | 6160662 |
| ·19 | 8789043 | 9859014 | ·60 | 5436628 | 6098478 |
| ·20 | 8663120 | 9717760 | ·61 | 5381969 | 6037166 |
| ·21 | 8540918 | 9580682 | ·62 | 5328065 | 5976699 |
| ·22 | 8422242 | 9447559 | ·63 | 5274896 | 5917057 |
| ·23 | 8306916 | 9318193 | ·64 | 5222444 | 5858219 |
| ·24 | 8194770 | 9192396 | ·65 | 5170684 | 5800159 |
| ·25 | 8085644 | 9069984 | ·66 | 5119605 | 5742860 |
| ·26 | 7979392 | 8950796 | ·67 | 5069186 | 5686304 |
| ·27 | 7875870 | 8834674 | ·68 | 5019410 | 5630469 |
| ·28 | 7774952 | 8721468 | ·69 | 4970263 | 5575340 |
| ·29 | 7676514 | 8611048 | ·70 | 4921727 | 5520894 |
| ·30 | 7580447 | 8503284 | ·71 | 4873790 | 5467121 |
| ·31 | 7486640 | 8398056 | ·72 | 4826434 | 5414000 |
| ·32 | 7394990 | 8295250 | ·73 | 4779648 | 5361519 |
| ·33 | 7305407 | 8194760 | ·74 | 4733417 | 5309659 |
| ·34 | 7217807 | 8096496 | ·75 | 4687728 | 5258408 |
| ·35 | 7132097 | 8000352 | ·76 | 4642569 | 5207751 |
| ·36 | 7048206 | 7906249 | ·77 | 4597928 | 5157676 |
| ·37 | 6966058 | 7814100 | ·78 | 4553794 | 5108170 |
| ·38 | 6885585 | 7723832 | ·79 | 4510155 | 5059218 |
| ·39 | 6806720 | 7635365 | ·80 | 4466999 | 5010808 |
| ·40 | 6729408 | 7548642 | ·81 | 4424317 | 4962931 |
| ·41 | 6653578 | 7463580 | ·82 | 4382096 | 4915569 |
| ·42 | 6579187 | 7380132 | ·83 | 4340332 | 4868720 |
| ·43 | 6506174 | 7298230 | ·84 | 4299010 | 4822368 |
| ·44 | 6434491 | 7217822 | ·85 | 4258120 | 4776500 |
| ·45 | 6364099 | 7138858 | ·86 | 4217658 | 4731113 |
| ·46 | 6294944 | 7061285 | ·87 | 4177613 | 4686192 |
| ·47 | 6226989 | 6985058 | ·88 | 4137974 | 4641728 |
| ·48 | 6160190 | 6910126 | ·89 | 4098737 | 4597713 |
| ·49 | 6094510 | 6836450 | ·90 | 4059893 | 4554140 |
| ·50 | 6029916 | 6763992 |
[Pg520]