Review of Prof. Johnson’s Report on American Coals. 317 
MENT ANTHRACITE. 
plates closed ; steam thrown out at back valve. 
5 e8\|2a 14 
a eases 
a |S/Ew6Es | so 
= NON Oa ifesie 
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SS sy |) SRE NPSL | ie 
$2|2|8e2!l.8 | 55 |Remarxs.—Grate surface 14:07 square feet; length of cir- 
ee ene oa ie a2 =| cuit of heated air 121 feet; height of chimney 63 feet. 
Scene ne 
© |S iss iseal vs 
I o MH 
S es |c2iosmu| Se 
2 | 8 jee Sasl es 
& jaloea = 
h.m. | 
- lr4.6 70 '—14 | - |/Water 0:12 inch below normal level; commenced firing ; 
6-07/74:9 725 1.23 fire in small furnace; two weights on safety valves; com- 
6°37 75°6) ee re menced charging with coal at 6h. 7m.; consumed 183% lbs. 
= (0101 76 | 2 of wood ; water in boiler, 0:47 inch above normal level ; 
- 75:3 '78 '_ 4 |0-821) temperature 225° ; fire kindles slowly ; took at 7h. Om. the 
| second weights from valves; syphon rose to 0:30; steam 
began to blow off; at 7h. 30m. filled tank. 
- |75:8| '77-5—16 | - |A charge of this coal reduced to egg size, weighs 105 |bs. 
8°30)76'1) 78 i 5 | - |Kindling takes place slowly. 
— |76-1) 81 +17 |0:554\Wind S., light; hazy, sun shining occasionally. 
— |75:8) 82 27 |0-434)Set upper damper to 4 inches at 9h. 35m.; coal igniting more 
- |76:6) 82 20 |1:791| freely. 
10°10 '76-3,101 21 1-335 
— |77-2) 96 25 11-367 
— |77:2:108 30 |0:636|Fire in small furnace extinct, and its damper closed; dew 
-| point, by observation, 74°. 
0:00,77-6)117 22 |1:351\Steam all thrown out at back valve. 
- |76:1)130 20 |2:013, Commenced drawing gases from lower opening at Oh. 42m. ; 
— |74-9/137 — |1:086) drew in 25 minutes 80 cubic inches, which gave 0°68 grain 
1:30,75°3 143:5) 16 |1°764) water, 4:33 grains carbonic acid, and 8-018 cubic inches of 
- 76°1)155 18 |2°236} oxygen; temperature at bath 87°; at Oh, 30m. p. M. wind 
= 75-9 158 | 14 |1695| N. W.; showery. 
3:00 77-8)171 9 |1:351 Wind N.E., light; clear. 
- |78:0)183 20 |1:324| Wind S.; dew point, by observation, 76°; by calculation, 
at same place, 77°°3. 
- |77:5)194 | 25 |1:992 Eighth charge shows much earthy matter in partings, tech- 
nically called “bony coal.” 
4°15 ,78-0,204 20 |1:669) Filled tank at 4h. 15m. P.M. 
— |76-6)224 18 |1:340,Cloudy ; wind E., light. 
5-30/75:8:230 | 29) |1:293 
— |78-4247 | 19 |2:215,Contents of ash-pit thrown on grate; both valves double 
weighted. 
- |79:4290 |— 1 | - |Water in boiler left at 1-6 inch above normal level. 
— |76:0)156 |—11 | - |Water found 3:10 inches below normal level. 
-— |75°3}182 |— 5 | — |Water in boiler adjusted. 
RESIDUA. 
Pounds. 
Clinker, - = “ - = a = s = = 4:00 
Ashes, : - - - - - - - - = 71-25 
Ashes behind bridge - - - - - - - - 1:26 
Total, - - - - - - - - = An uAGiOL 
Deduct wood ashes, - - - 2 = = é 0:564 
Total waste from coal, - = = + = = Z 75:946 
Coke, - - - - - - - - - - 67:99 
Vol. xt1x, No. 2.—July-Sept. 1845. 
Al 
