Text: "separate extractors are not necessary, but if you spray more than five customers per day, an external extractor should be used or an extractor booth with built-in filters.

Correct capitalization: "Separate extractors are not necessary, but if you spray more than five customers per day, an external extractor should be used or an extractor booth with built-in filters.

Text: indeed after taking part ii of the mathematical tripos in 1942 he was assigned to duties with the ministry of supply as a scientific officer and he was sent to the cavendish laboratory.

Correct capitalization: Indeed after taking Part II of the Mathematical Tripos in 1942 he was assigned to duties with the Ministry of Supply as a scientific officer and he was sent to the Cavendish Laboratory.

Text: the dirty water pump is multifarious in use and can transfer or drain dirty water with particles.

Correct capitalization: The Dirty Water Pump is multifarious in use and can transfer or drain dirty water with particles.

Text: he also lost his forearms and spent a while in hospital.

Correct capitalization:
He also lost his forearms and spent a while in hospital.