Review of Prof. Johnson’s Report on American Coals. 317 
MENT ANTHRACITE, 
plates closed ; steam thrown out at back valve. 
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S&|>|S2',8 | 2. |Remarxs—Grate surface 1407 square feet; length of cir- 
2™(2| 23 (°% .| Z| euit of heated air 121 feet; height of chimney 63 feet. 
2 1B {22 1389! Seo 
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70 | 14 | - [Water 0:12 inch below normal level; commenced firing 
6-07\74-9, 72-5 x fire in small furnace; two weights on s fety valves; oe 
6:37 zi enced charging with coal at 6k. 7m.; consumed 1833 1b 
= 76.15. oO ‘ ter in boiler, 0°47 inch above normal level ; 
- (153 78 - 4 loge temperature 225° ; fire kindles slowly, to ok at 7h. Om. the 
second weights from ge 5 e to 0 30; steam 
began to blow off; at 7 filed ab: 
- |75°8| 775—16 | = |A charge of this coal cheb e to egg ‘ion, —_— 105 Ibs. 
8:30\76:1! '78 Ls Kindling t 
= 1961) GL fit 0- 554 Wind S., li rid ssa sun aie osiiealiinall 
- |75°8) 82 | 27 . tt pe ae amper to 4inches at 9h. 35m.; coal igniting more 
- |76:6| 82 | 20 
10:10,76-3101 | 21 1 335 
— |77-2|.96 | 25 
- |772108 | 30 O636 mage had small furnace extinct, and its damper closed; dew 
t, by observation, 74°. 
0:00 77-6; 117 351 too all thrown out at back valve. 
— \76°1)130 | 20 (2-013 Commenced vies 1g gases from lower opening at Oh. 42m.; 
‘9137 | - |1-086| drew in 25 minutes 80 eubie inches, which gave 0-68 grain 
1:30 75:3.143'5} 16 {1-76 ater, 4°33 g and 8-018 eubic nepen sof 
761/155 18 |2°236 fe aah temperature at bath 87° ; at Oh. 30m. Pp. M. wind 
= (7591158 | 14 (4-695) NN. W.; 
3:00.77-8.171 9 ine: ba = z, Tight ‘clear 
- |78:0183 | 20 point, by observation, 76°; by calculation, 
| a a pk place, 77°: 
ram (i yer 25 |1 ee gn ge shows wo 9 earthy matter in parting tech- 
“ ny c 
41578-0204 | 20 j1- wkend Filled pls at 4h. pa, M. 
- |766224 | 18 (1-340 Cloudy; wind E., light. 
5°30,75-8230 | 29 /|1-293) : 
= mp Re 19 2-215 Contents of ash-pit thrown on grate; both valves double 
weighted 
- |79°41290 |— 1} - warerit in boiler left at 1°6 inch above normal level. 
- th 0 He —l1 | -.|Water found 3:10 inches below normal level. 
- {753/132 |—5 | = |Water in boiler adjusted. 
RESIDUA. 
Pounds. 
| rg - ee - - f . . “ s 4-00 
d th - - - = = - 71:25 
‘Ashen behind bridge, - - 7 . 4 * + 1:26 
Total, = * - 
Deduct wood ashes, - - - - a “i x 5 
Total waste from coal, - - - - - - - 75946 
Coke, - é 2 z a a 
Vol. xx1x, No, 2.—July-Sept. 1845. 41 
