Final answer:
The Bobbin flowmeter is the component that is no longer used in gas delivery in all anesthesia machines.
Step-by-step explanation:
The component that is no longer used in gas delivery in all anesthesia machines is the Bobbin flowmeter. Anesthesia machines have evolved significantly over time, enhancing patient safety and efficacy in delivering anesthetic gases. Anesthesia machines today incorporate elements such as the APL (adjustable pressure limiting) valve to prevent excess pressure buildup in the breathing system, ventilators to support patient breathing, scavenging systems to remove excess anesthetic gases and chemical CO₂ absorption to eliminate carbon dioxide from the recirculating breathing gas. However Bobbin flowmeters, once common, have mostly been replaced by more sophisticated digital or electronic flowmeter devices that provide more accurate control and monitoring of gas flow.