Found the following hamletworks.org entries referring to line 3740

View Commentary Note for 3738, etc.
3738 The Cannons to the heauens, the heauen to earth,5.2.277
3739 Now the King drinkes to Hamlet, come beginne. {Trumpets}{N4v} 
3740 And you the Iudges beare a wary eye. {the while.} 3740 

View Immaterial Textual Note for 3738, etc.
3738 The Cannons to the heauens, the heauen to earth,5.2.277
3739 Now the King drinkes to Hamlet, come beginne. {Trumpets}{N4v} 
3740 And you the Iudges beare a wary eye. {the while.} 3740 

View Material Textual Note for 3738, etc.
3738 The Cannons to the heauens, the heauen to earth,5.2.277
3739 Now the King drinkes to Hamlet, come beginne. {Trumpets}{N4v} 
3740 And you the Iudges beare a wary eye. {the while.} 3740