322 Review of Prof. Johnson’s Report on American Coals. 
Synoptical Table, (continued.) 
Action of furnace during steady 
Combustion. pressure. Evaporation. 
ea ~<a] - Water supplied 
ne 5 55 & Mean temperature 3 @ Pressure. | per hour ae 
SoMa: ao} 2 “= Opel oie steady action, 
q iz ee | : oS = ‘= SEs eo 
heed |ahes >| ‘3 i ee Ss) 1 c Se = = 
a a ms | O = =I a = = om 5| 8 ° oe 
g P= a ‘CS 8 Ss eb 0 iS £ H = ple 2 gs 3 Ss 
2 SEU | eal ya ae hr = 2 Sf fasl Bele | 23 $s 
Designation of 3 {o8 [Sel os) 2 | & eS}ssolss/ett2 |ss a) eee 
coals ge [Ss |22/8s| 2 | Es] Se] w@]eslog/*%.j3e] . i (nee) 
* 8 /Se/Ssle2| 2] s2)] o&/ Ss |; elSs) gs] Fs) os | @ | se 
a 23 as} Sul] co ag fet gd ie Ou! DO] HE w Glos 2 us 
Qo ]/@H!/eqo0} -£ Ona sauce S| Boj Ha) 2s rs vel = oo 
S am }/He|s o 5a | pe] ws 15 S| ae ag) AO 3 as 
5 S oo! > 6°] 25/58 ]& | os) as] a al ° nn 
i) an Ar= | o 5 2) oS] Q2 |b EH OI SOY (= a |Uw 
7, 2 a & a Ts Sy eeg| su fs 3 2\¢8 g es | 5 s 
= S ge Se = 3 & me g lass oa a2 
Sle Bale te Bole ee aa ic as Se 
Ea 2 I FR ales = 2 eb | OMNI an NPE! 
Barr’s Deep Run, |5072'75|10693|7-600|7-992|222-87|328-68|163-02) 96 -53]0°382|1 520|1-436|6-444)838. 93) 13:42] 2218 
Crouch & Snead’s, |3834°75| 97-90|7-133|8-576|199-66|306:87|133:71) 81-78|0-:359|1-158|1-417/6-165|724-41/11-649|2:071 
Midlothian (900 feet F 
ehete average coal,|3417-50/122-10|8:678|8:348/247-13|348-61|179-90 114-90|0-367|1-383]1-421/6:222|907'11|14-513)2-403 
reek Company’s 
coal, - - - - |3769°63/120-94|8-595|8-445|276-49|337-89|196-76 114:14]0°318|1-166|1-431|6°367|930'40) 14-885 eee 
pene Hill, - - 8775-10) 89-56/5-843/9-340/362:51|302-54|297-95) 74-81]0-145|1-933]1:416/6°144/521‘89| 8343/1382 
hesterfield Mining 
Company, - - |3876-00/119-02|8-459|9-069|252-011344-58/172-28 113-72] 0-299]1-166|1-437|6:461|909-74| 14-467 2-409 
Midlothian, av’rage,|4506-39) 9027/6 676|8-756|247-72)289-01|171-89) 65-07|0-214|1-516 1-486)6-441)630-71)10-091/2-019 
Tippecanoe, - - |4904-75/108-95|7-369|9-361/325-25|302-15/266:66| 72:11|0-231|1-333)1-426|6-291 663-59) 10 °622]1-757 
Midloth, ‘new shaft’|2918-50|108-33]7-604|8-132|263-23|306-39]186'63) 75-12|0:322|0-905|1-419 6-188,844'33}13-460)2-229 
Midloth., screened, |4132-00| 86 22/6-239'8-001|285:65/297-78/216:95, 70-63|0:179|1-289|1-425|6-283 632'10/10-113]1-674 
Midlothian, (avy 
yard,) - - 1463:50} — seagate uy pis = at hie des z s eS 2 
Synoptical Table, ( continued.) 
( 3 Lead reduc’d 
Evaporation. Residue from furnace. |F0, litharge 
Steam, in pounds, cor-| Effect of open | & = 3 s s 
rected for temperature air-plate : = petal ite 3 
of water incistern, to | (+gain, —loss.) io S 5 = 5 
‘3 a 3 = 3 § a Stic: 3 ® 
= i) N S s ° = 
Byler ete | os & jus| g| 2 les = 
Designation of coals. g5/ §/°.|/se] 3s Be hay eee 5s 3 
Pele esi alse |b eS les) | eee aa 
a3/ 4/1 8n|3e| So SS SS tes.) sree cies ali ies § 
ia ES 215 > S SH S r= =| oa 2 ° 
@O| Gloi| sel] gs SB | ek | Sle ee elle 
Sale | eee (nS tod So 4S es, Sc, cee ean 
coven Yee, SLPS foal sects 8 eet hie g Plas a = 
Se ge elle ele Bee | se 0 (diab ele an ential 
o o o o + = 
[= iS) = GI iS Lal by 
G8 OS Nee WS 6 EE | Sle ee ee 
Barr’s Deep Run, - - - 7845 9:018/478-74/10-142|— 5:056/— 7:584]11:073/4-748 0:4288) 6:400/24°620 28-007, 
Crouch & Snead’s,- - - - |7-298 8:345/445-02| 9-740'4+ 2-990|— 6-802|14-340 5-371 03752) 6-000|19°617|25-775 
Midlothian (900 feet shaft) av- 
erage coal, - - - - - - |7:4998-584/433-73] 9-611|— 2-613/+ 6°634]10-702/6-466|0'6045| 5-917/25:035/26-993 
Creek Company’s coal, - - 17-444 8-417/391-85] 9-211|+-15-017 +32:179] 8:641}4:415/0°4984 10-530)28°100 30-523 
Clover Hill, - - - - - - |6-713 7:675/347-44| 8-588|— 6.633|—25-979)10-601/3-859 0°3680 11-512|26-962|28-527 
Chesterfield Mining Company,}7-949 8-998/410-89| 9:896'+ 1-623/— 1-895] 9-069/4-189/0:4628/10-469 25°784|27-376 
Midlothian, average, - - - |7-303 8:295/448-46 9:'741|+ 0-152/—21-610/14-827/8:821|0:5954) 6:442)27°344/29-027 
Tippecanoe, - - - - - - 6-743 7:'748/350-23| 8-583\+ 7-994/+11-345] 9:723 4:034/0°4150 11-250 ore eae 
Midlothian, “new shaft,” 7-665 8°750/418°61] 9:751\+ 2-653)+ 6-217|10-258'4:214|0-4218 17-083 parse 
Midlothian, screened, - - - |7-836 8:944/408:72| 9-970|+ 3:471|+ 0-190|10-271|3-329'0-3242) 14-800 bee 
Midlothian, (navy yard,)- - | - | — | — = = -  120-100/4:424] — |43-250)25-180,27:2 
Four of these synoptical tables will be found in the Report. 
Prof. Johnson having in these experiments the most satisfactory 
means of determining the practical heating power of coal, was led 
to inquire whether the celebrated process of Berthier, by the re~ 
duction of litharge, could be depended upon as a means of deter- 
