▁th im ble ▁kn ur ling ▁machine . ▁The ▁London ▁Gazette ▁of ▁ 1 7 ▁March ▁ 1 6 9 1 ▁stated ▁" the ▁pat ente e ▁hath ▁also ▁project ed ▁a ▁very ▁useful ▁engine ▁for ▁starting ▁of ▁be ers ▁and ▁other ▁liqu ors ▁which ▁will ▁deliver ▁from ▁ 2 0 ▁to ▁ 3 0 ▁bar rel s ▁an ▁hour ▁which ▁are ▁completely ▁fixed ▁with ▁br ass ▁joint s ▁and ▁sc rew s ▁at ▁reasonable ▁rates ." ▁ ▁The ▁lock sm ith ▁and ▁hyd ra ul ic ▁engineer ▁Joseph ▁Br am ah ▁developed ▁be er ▁p ump ing ▁further ▁in ▁ 1 7 9 7 . ▁ ▁The ▁be er ▁engine ▁is ▁normally ▁manually ▁operated , ▁although ▁elect r ically ▁power ed ▁and ▁gas ▁power ed ▁p umps ▁are ▁occasionally ▁used ; ▁when ▁manually ▁power ed , ▁the ▁term ▁hand p ump ▁is ▁often ▁used ▁to ▁refer ▁to ▁both ▁the ▁p ump ▁and ▁the ▁associated ▁handle . ▁ ▁The ▁be er ▁engine ▁is ▁normally ▁located ▁below ▁the ▁bar ▁with ▁the ▁visible ▁handle ▁being ▁used ▁to ▁draw ▁the ▁be er ▁through ▁a ▁flexible ▁t ube ▁to ▁the ▁sp out , ▁below ▁which ▁the ▁glass ▁is ▁placed . ▁Modern ▁hand ▁p umps ▁may ▁cl amp ▁onto ▁the ▁edge ▁of ▁the ▁bar ▁or ▁be ▁mounted ▁on ▁the ▁top ▁of ▁the ▁bar . ▁ ▁A ▁p ump ▁clip ▁is ▁usually ▁attached ▁to ▁the ▁handle ▁giving ▁the ▁name ▁and ▁sometimes ▁the ▁bre wer y , ▁be er ▁type ▁and ▁alco hol ic ▁strength ▁of ▁the ▁be er ▁being