Show Precaution Necessary y In hi Removing Gaskets In the vacuum tank when It t Is necessary noces- noces sar nary sary for any reason to dismantle the device the head may bo ho taken off ott by re removIng removing removing re- re moving tho screws around lr unil tho edge of ot ho tho cover There Is a gasket placed between the head nn and tho the body an and the utmost care caro must be bo taken In handling because If It the tho gasket Is not absolutely ely tight leakage will result and tho the operation operation operation op op- of ot the tho system will wm bo be impaired |