This poem pretends to be about perfume-making, but it's actually about writing poetry. Dickinson is explaining her own artistic process through industrial metaphor.
The key is 'screws'—a deliberately harsh, mechanical word. She's saying beauty doesn't just happen naturally ('not expressed by suns alone'). It requires pressure, force, compression. The rose must be crushed. In poetry, this means: lived experience must be distilled, concentrated, wrung out through the painful work of revision.
CONTEXT Dickinson rarely published during her lifetime, but she obsessively revised her poems, sometimes creating multiple versions of the same piece. She knew about compression.
The payoff comes in the second stanza: 'The general rose decays'—the actual experience fades and dies. But the poem (the 'attar') 'makes summer' even after the poet is dead. The lady lies in her coffin, but her extracted essence—her poems—keep the experience alive. Poetry is preservation technology.