THE GAS COALS OF OHIO. 737 
Pounds. |Per cent. 
Wieiehttoterasn(SpeCaeravey ESt-.) D00)lcccsctscscecteecscccenserctesesso sss. 35.26 17.63 
a COR CBee eae ees en noe ahe vec Quiet piMaauitane Meets cuieweh eee fees vances 114. 57. 
UAT een see ccce ee cecstcssontes st Bag asoko RARSCROOB GRECO OnE 11. 5.50" 
sf Ni GUL O Tyree erase issesiws scloweetacen ocaeceaceitersssiesseseasesecsoonsp ss 20. 10. 
SM OS Lene e te cota Aa Mena Nr an cd close vanes ses tateaunatsstast seperos OSCR 19.74 9.87 
MRO Gal ereemectrew aes ccteNct ce secrs cis vac teicnateseceecaesdeeeeceteawmed teas meee 200.00 100.00 
To show that the quantity of volatile combustible matter a coal: 
contains does not indicate the quantity of permanent gas present, I 
append a table from the Ohio Report of 1870. The analyses were made: 
by Prof. Wormley : 
Volatile combustible Fixed gas—cubic feet 
matter. per pound. 
BAA ORR UN te ee NIA Sal vacien oases Sad avaete ek seus 3.32 
COLA Once naan cetac ares Lubin Neseiewe se asce wa sedtineeseesss 3.44 
ZEOO rac neer ees Mnten tae Cent wid ives san eoeee tone: 3.36 
POM OMe etre nea cipencatatcsocknes Nese toonsudares sects 3.12 
DPA rere acne ee Nee ee eae seis Soke sehen evbeesee neues 3.11 
BO NiO tear stoner aeen cesshe haat iacSadiss ste s cuistens messes 3.51 
DY GO eeiscca sana Acaw act setae ss cwaesccetan Shacks ceases 3.54 
S157.10) sa eisne CaCO HORE CCE Cone RIE ECE ne Re eee Ee 3.42 
OND esmnccccneseean: Amn cae ate cu ulieaweceees ves ve 3.16 
Dine Deccuasc chien tere et eave soe esos eonncseeaneteee 3.12 
BO OO Be cai eee Mane le wee Hise ut teas Sed Ca Gt al cclalah isk 3.65 
BOLO Messe cea seentine Necearnne cae nce van cenosiuiere etic eats: 3.03 
Bholto U sanerpctn sap aCe SaseCssea: ERO a er cee oe 3.16 
BONA D eacie soks ature aaiscap Men crec ese mceddmacedobeasts 3.35 
The Waterloo, or number 7 coal, gives the best analysis for the 
average of vein of any coal found in Wormley’s reports. 
This coal has not been tried in a gas-works, at least not from the 
fine field in Lawrence county. All things considered, the coal from 
Antiquity, near Pomeroy, Meigs county, number 8, or Pittsburgh seam, 
is the best for gas making of any that has yet been tried in the State. 
Fair yield, high illuminating power, easily purified and producing a 
good coke, these facts put this at the head of the list of Ohio gas coals. 
A very general and superficial description of a gas-works plant will 
probably suffice for this volume. There has been no very marked 
change in apparatus used in gas-works during the last quarter of a cen- 
tury. The generating apparatus consists of retorts, now made of best 
fire-clay, formerly made of cast-iron. The retorts are usually about. 
nine feet long by 14x24 inches inside measure, and generally (7 (semi- 
al Ce 
