priestleys mouthpiece and a representive for socialism and the working class
'the inspector need not be a big man but he creates at once an impression of massiveness, solidity and purposefulness' suggests that the inspector is strongwilled and determined sugessting once the inspector has decided to do something or seek out some information he will not give up.
The second sentence, 'he is a man in his fifties, dressed in a plain darkish suit of the period' ,establishes that he is an opposition to mr and mrs birling as 'plain darkish suit' contrasts nicely with the formal clothes the rest of the characters r wearing. This contrast could hint that the inspector comes from a different background to the birlings and gerald, and could be seen as a representitive between his socialist views and their capitalist views
The last sentence, 'he speaks carefully, weightly, and has a disconcerting habit of looking hard at the person he addresses before speaking', portrays his as being a bit intimidating but not aggressive, he demands respect and expects the truth.
'no, thank you, mr birling. i'm on duty' - showing he is polite and shows the inspector is incredibly incredibly professional. marks a sudden change in mood. seriousness.
(massively taking charge) - inspectors authority and dominance is asserted time and time again . often interupts characters or draws attention back to himself. stage directions like this r frequent throughout the play. Priestley asserts greater authorial control through his use of stage directions which demands that the characters his play act in certain ways.
'you see, we have to share something. if there's nothing else, we'll have to share out guilt' - inspector believes in social responsibility, suggests that there guilt is something to be shared ( doesn't blame anyone specifically)
act 2 - ' don't stammer and yammer again at me, man. i'm losing all patience with you people' - professionalism has faded, he has snapped at birling, indicating he views mr birlings input as none sense. 'you people' = middle and upper classes, fustrated by the upper and middle classes inability to accept responsibility. clash of socialism and capitalism.
'then they will be taught in fire and blood and anguish' - there will be another war ( this was in 1945 but based in 1912) authorial intent - makes the audience think and want to accept social responsibilty as they have already gone through the horrors of war