After great pain, a formal feeling comes –
The Nerves sit ceremonious, like Tombs –
The stiff Heart questions ‘was it He, that bore,'
And ‘Yesterday, or Centuries before'?
The Feet, mechanical, go round –
A Wooden way
Of Ground, or Air, or Ought –
Regardless grown,
A Quartz contentment, like a stone –
This is the Hour of Lead –
“Ground” and “Air” may be references to the life of the narrator, that continue regardless of the tragedy. Life goes on, physically stifling and freezing the narrator in this feeling of loss because it cannot be similarly felt by others. 
 “Ought” suggests that the speaker is stuck, woodenly going through the tasks she “ought” to be doing.  It is also a  homophone  with “aught,” meaning nothing.  This image of zero recalls the circular motion of the feet in line one.
After great pain a formal feeling comes J341 F372