188 "GECtOGY OE OHIO. 



yard right is "not apparent" aiid'it is now chiefly confined to those who are 

 entering the business for the first 1 time' and are 'not familiar with; the 

 results of hioderh practice. 



The 'statistics of the kilns actually in use in the state will prove of 

 interest in this connectiori.' ' .■■-..■ .• ■ J 



A — Paving Material. ' '■ •■ 



V.- Round down drafts=" -i» i < ■■■*. ' ', .-.,'. 



.: ,. Cqmaipii unpatented 252 ., , 



, , , - New discovery. , , , .,..,.„,........ 20 , 



Eudaly '. 4 " 



;;,.-.', !' ,' ; ; .;. 1 •,;■ .'v.>< ' -■. . ■ ■ : . • V -276-, 



2.' Rectangular down drafts — 



Unpatented.... '.:'.... ..!'.'. ..'.........20 ,; ' '" 



Eudaly....: '„..'.„....„.. „":.'.:,... '..:...'..'.. :.... : ....'.. , ..r....'. :....;:/.- '.'.'.41 ' 



Yates ■■;. ......,..;„.....: ■. v...: •..:.' ...........i 3 , ... 



- Hallwood ,,.,........ , ,.,.., ., S 



3. Updraft clamps used in burning paving material— 72 



Updraft :..'.: ];....;.....,;.........:...., ;;.- lg, . ,;■ 



Total kilns...: ; „..„.. .'..'..'..J ..\::.:..'..364 



B.— In the' sewer pipe business the kilns' employed' are r : ■ ■• . ■ , 



1. Round down draft ;....;........ ..,..• :.;.„• 369,,. ': 



2. Rectangular Akron dowudraft .:,......., ; ,., 7^. 



" ■ ' • ■■ . 448' 



The total number of kilns in the two industries is 812^— of which 

 621 or 76.4 per cent, are' round and 191 or 23,6 per cent, are all other 

 kiiids together: '""' -•,..:.-■ 



•'-' 'Of these round kilns; those used in the manufacture- .of brick have 

 an average diarfieter ' of twenty-five and 6ne j tenth feet, and an average 

 capacity when' set 25 courses high; of' 30,000 bricks. • -'.■'■-■ 



If set full, the capacity would be about 40,000. The "maximum dia- 

 ihete'r is thirty feet and the minimum Seventeen feet. • Of the sewerpipe" 

 round kilns, the average 'diameter is twerity-seVen and three tenths feet 

 with maximum and minimum diameters of thirtythree ■ and twenty-two 

 feet. --• ■• ■■ " ■ ■ - • '• - ■ .:• . .... ''■/>: ., , . 



"■ ' ' The' production' of paving material-has now been as. iuMy discussed 

 as the- spate will allow. The ; clays; their- preparation, their manufacture; 

 their drying, and their burning' have- been treated. - Much remains to be 

 sa'id about the' methods of handling this' output, arrangement' of plants 

 and similar question's" which would be <usefiil< and interesting to. -those 

 eiigaged 'in 'this' 'line of work,- but -their -remain's' available space -fortha 

 discussion of only one more topic in this connection, which is the testing 

 6f paving^ materials- and the- results ' : 'of the - Ohio^materkls»iwhich'ihave 

 b'eeii subjected : to'6fH'ci'ai test: : - ' ■.■■•', .. ; « .■ /■■.-,-;• ,...•,- 



"■'- ' -The! Ti>MiHg of-Pavitig Material.' ■ The testing '-of paving 'material 

 haS'beeh subjected b ihofe" inquiry and" discussion perhaps thaw any .part 



of 'its' production." ■ .v *<■'<■). .''■.'.-■.■•..■ • •<'i.- , ,,.,.- ,...-,,, ..,,■;<,.,( 



"' ': What eorist'itutesthebestmeahsoftestihg?'-'' 'As-previously described; 



