Tracheal shift to right due to thyroid swelling seen above the level of the clavicle. Tracheal compression can rarely cause stridor in this situation.

Halothane delivery device used for delivering metered dose of halothane for general anaesthesia. The device can be attached on the Boyle’s machine and halothane vapour delivered along with oxygen through the endotracheal tube. Halothane is an inhalational anaesthetic agent like nitrous oxide and isoflurane.

Boyle’s machine used for delivering oxygen and anaesthetic gases for general anaesthesia. Flow meters for nitrous oxide and oxygen as well as delivery device for isoflurane are seen attached to the top bar. Pressure guages for nitrous oxide with blue screens are seen on the left side and those for oxygen with white screens are seen on the right side.

Nitrous oxide and oxygen flow meters as part of a Boyle’s apparatus used for anaesthesia. The position of the float in the graduated tubing goes up as the flow increases.