Safety machine; : a light check-valve between the exhauster and condenser, with blow-off through roof of house.

Safety machine; : a light check-valve between the exhauster and condenser, with blow-off through roof of house.

Lamson, Charles Dpht

Boston Gas Light Company.

still image

1887.

N/A

Machinist, J.P. Clark standing next to "safety machine" at Commercial Point Station

Electronic reproduction.

Boston Gas Light Company

Gas companies

Gas manufacture and works

Machinists

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