With the introduction of nitrous oxide for patients undergoing dental treatment, 100% nitrous oxide was usually administered as an anaesthetic. This caused the patient to lose consciousness quickly and could also cause severe hypoxia. In the late 1890s, dentist Samuel Stockton White introduced this two cylinder apparatus, which could administer oxygen with N2O.Early model apparatus with cast iron stand, and two gas bottles. Comes with two canvas gas bags and a detached metal mask and fabric connecting tube.samuel stockton white, nitrous oxide, oxygen, hypoxia

Black and white photograph depicting a labour ward in a hospital, with two men in business suits standing on the left of the photograph next to an nitrous oxide machine. A woman patient is lying in a hospital bed on the right, wearing a hospital gown and holding the mouth-piece of the apparatus to her face. The two men are looking down at the equipment and the man on the left, Dr Kevin McCaul, is pointing at the patient, demonstrating the use of the demand flow nitrous oxide/oxygen apparatus. A lamp is above the bed and there are curtains behind the men on the left.•Handwritten on reverse in grey pencil: 1 [in a circle] •Printed stamp in blue ink on reverse: 51 4776 / PHOTOGRAPHED BY SPECIALIZED / PHOTOGRAPHIC / COMPANY PTY. LTD. / REF. No .................... 240 CHAPEL STREET / TAKE ........................ PRAHRAN, VICT., S1 / PHONE 51 4776 / 51 1752 •Handwritten in black ink on reverse: 4874 [next to REF. No] / D [next to TAKE]nitrous oxide apparatus, demand flow apparatus, kevin mccaul, anaesthetic equipment

This Boyle’s machine was made by the British Oxygen Company (BOC) in the 1950’s. The original Boyle's machine was invented by the British anaesthetist, Henry Boyle in 1917. His machine was a modification of the American Gwathmey apparatus of 1912, and became the best known early continuous flow anaesthetic machine. The Boyle’s machine was first made by Coxeter and Sons, under the direction of Lord George Wellesly, which was later acquired by the British Oxygen Company (BOC). Though a lot of changes have been made to the original design of the Boyle’s machine, the basic structure remains the same today.Green trolley on casters with flowmeter and vaporiser bottles attached to a stainless cross bar. There is a glass shelf at top of the trolley and a second glass shelf at base of trolley, above a pull out drawer. The pull out drawer contains 4 x black rubber masks, 3 x black rubber tubing connectors, 4 x seals, 1 a black corrugated rubber hose with red rebreather bag, red tube and masonite support board.Tin plate attached to upper portion of trolley: THE / BOYLE / apparatus / BY THE BRITISH OXYGEN CO. LTD.henry boyle, anaesthetic machine, gas, oxygen, flowmeter, nitrous oxide, british oxygen company, boc, coxeter and sons

Robert James Minnitt introduced the concept of self-administered analgesia, using an apparatus designed and built in conjunction with London scientific instrument-maker, Charles King. The Minnitt apparatus met with considerable success and led to further modifications, including the introduction of the Queen Charlotte gas-air analgesia apparatus in 1936, manufactured by the British Oxygen Company.Black and white photograph of a Minnitt gas/air analgesia apparatus, in a Queen Charlotte case. The case is standing open with the apparatus inside. A label with instructions is on the left side of the case, and the apparatus is on the right side of the case. A nitrous oxide cylinder tank and valve is connected to a small box with a regulator. A tube with a breathing mask is attached to the box. The Queen Charlotte case has hinges on the side and a handle on the top.minnitt gas air apparatus, minnitt, nitrous oxide, queen charlotte case, anaesthetic equipment

Black and white photograph of a drawing of anaesthetic equipment, a flowmeter and an ether vaporiser. On the right is the ether vaporiser inside a glass cylinder, with a control tap on top of it. It is attached to a metal cylinder which houses the flowmeter which is measuring the Oxygen and Nitrous Oxide. There is a round Oxygen control and a Nitrous Oxide control attached underneath the metal cylinder, as well as an Oxygen Bypass and a Nitrous Oxide Bypass. The diagram has each part of the apparatus named with an arrow pointing to the parts.ether vaporiser, anaesthetic equipment, flowmeter, nitrous oxide, oxygen

Black and white photograph of an anaesthetic machine, likely to be a portable Foregger anaesthesia apparatus. Flowmeters with glass cylinders including Oxygen and Nitrous Oxide sit on a metal benchtop of a trolley with two drawers. A glass vaporiser is attached undernath the metal benchtop and there are metal valves attached on either side of the benchtop.anaesthetic apparatus, anaesthetic machine, foregger anaesthesia apparatus, flowmeter

Black and white photograph of the head of a portable Foregger "Metric" Gas Anaesthesia Apparatus. The apparatus has glass flowmeters and controls for fine and coarse oxygen, cyclopropane, nitrous oxide and carbon dioxide. There is also an ether container and a blood pressure nanometer.•Handwritten in grey pencil on reverse: Dr. Desai's Special Metric •Handwritten in black ink on reverse: III. •Handwritten in grey pencil on reverse: dvpd.anaesthetic equipment, anaesthetic machine, flowmeter, foregger metric gas anaesthesia apparatus, oxygen, nitrous oxide, carbon dioxide, cyclopropane