▁appeared ▁in ▁April ▁ 1 9 5 5 ▁shortly ▁before ▁his ▁ret irement . ▁ ▁Ing alls ' s ▁primary ▁interests ▁were ▁in ▁the ▁areas ▁of ▁astronom y ▁and ▁teles cope ▁construction . ▁After ▁reading ▁an ▁article ▁by ▁Russell ▁W . ▁Por ter ▁on ▁teles cope ▁making , ▁he ▁arranged ▁a ▁visit ▁by ▁Por ter ▁to ▁New ▁York ▁in ▁June ▁ 1 9 2 5 , ▁out ▁of ▁which ▁came ▁an ▁article ▁later ▁that ▁year ▁in ▁Scient ific ▁American . ▁The ▁article ▁was ▁so ▁well ▁received ▁that ▁Ing alls ▁began ▁a ▁series ▁of ▁columns ▁on ▁amateur ▁teles cope ▁making , ▁some ▁written ▁in ▁collaboration ▁with ▁Por ter . ▁Ing alls ▁and ▁Por ter ▁became ▁close ▁friends ▁and ▁the ▁two ▁men ▁remained ▁at ▁the ▁center ▁of ▁the ▁American ▁amateur ▁teles cope ▁making ▁community ▁for ▁the ▁next ▁thirty ▁years . ▁A ▁number ▁of ▁articles ▁from ▁the ▁columns , ▁together ▁with ▁illustr ations ▁by ▁Por ter , ▁were ▁published ▁in ▁book ▁form ▁as ▁Am ateur ▁T eles cope ▁M aking , ▁the ▁first ▁volume ▁of ▁which ▁appeared ▁in ▁ 1 9 2 6 , ▁followed ▁by ▁volumes ▁ 2 ▁and ▁ 3 ▁in ▁ 1 9 3 7 ▁and ▁ 1 9 5 3 . ▁ ▁These ▁books ▁helped ▁to ▁create ▁last ing ▁public ▁interest ▁in ▁observ ational ▁astronom y . ▁The ▁books ▁have ▁come ▁to ▁be ▁called ▁" the ▁b ible ▁of ▁teles cope ▁making ". ▁ ▁During ▁World ▁War ▁II , ▁Ing alls ▁organized ▁the ▁work ▁of ▁amateur ▁teles cope ▁mak ers ▁to ▁help