▁clock d ial s , ▁large ▁and ▁small . ▁Two ▁English ▁develop ments ▁during ▁the ▁ 1 7 th ▁century ▁call ▁for ▁special ▁notice . ▁The ▁first ▁was ▁an ▁attempt ▁to ▁use ▁en am el ▁with ▁br ass , ▁a ▁difficult ▁matter , ▁as ▁br ass ▁is ▁a ▁bad ▁medium ▁for ▁en am el . ▁A ▁number ▁of ▁objects ▁exist ▁in ▁the ▁form ▁of ▁fired ogs , ▁cand l est icks , ▁c ask ets , ▁pla ques ▁and ▁v ases , ▁the ▁body ▁of ▁which ▁is ▁of ▁br ass ▁roughly ▁cast ▁with ▁a ▁design ▁in ▁relief ; ▁the ▁h ollow ▁spaces ▁between ▁the ▁lines ▁of ▁the ▁design ▁are ▁filled ▁in ▁with ▁patch es ▁of ▁white , ▁black , ▁blue ▁or ▁red ▁en am el , ▁with ▁very ▁ple asing ▁results ▁( cf . ▁Fig . ▁ 7 ). ▁The ▁nearest ▁anal ogy ▁is ▁found ▁in ▁the ▁small ▁en am elled ▁br ass ▁pla ques ▁and ▁icons ▁produced ▁in ▁Russia ▁in ▁the ▁ 1 7 th ▁and ▁ 1 8 th ▁centuries . ▁The ▁second ▁use ▁of ▁br ass ▁is ▁found ▁in ▁a ▁group ▁of ▁lo cks ▁of ▁intr icate ▁mechanism , ▁the ▁cases ▁of ▁which ▁are ▁of ▁br ass ▁cast ▁in ▁open work ▁with ▁a ▁del icate ▁pattern ▁of ▁scroll ▁work ▁and ▁bird ▁forms ▁sometimes ▁eng ra ved . ▁A ▁further ▁development ▁shows ▁solid ▁br ass ▁cases ▁covered ▁with ▁rich ly ▁eng ra ved ▁designs ▁( cf . ▁Fig . ▁ 8 ). ▁The ▁Victoria ▁and ▁Albert ▁Museum ▁of ▁London , ▁contains