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Civil Defence Information Leaflet 2
on gas masks and blackout for World War Two

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Public Information Leaflet No 2.

Front cover of WW2 Civil Defence Leaflet no 2 - thumbnail

Click to enlarge.

Inside front cover of WW2 Civil Defence Leaflet no 2 - thumbnail

Third page of WW2 Civil Defence Leaflet no 2, thumbnail

Last page of WW2 Civil Defence Leaflet no 2, thumbnail

In July 1939 the British Government was preparing for war. War was not to come until September but the Lord Privy Seal's Office distributed leaflets to the public under the banner of the Civil Defence. Public Information Leaflet no. 2 had two titles Your Gas Mask and how to use it and Masking your windows (better known as the 'Blackout'). My thanks to Teresa and Bill Finch for allowing me to photograph their copy for this website.

The leaflet consisted of a single sheet of paper folded double, with a two-page spread of information on the inside continued on the back. It was clearly produced in haste as the distinction between headings and text emboldened for emphasis is not always clear. The sexist language of treating everyone as 'he' jars today's ears.

Note the imperial rather than the decimal system of weights and measures. Note, too, the various terms which are no longer readily recognised, but which I just remember from my childhood and which were then commonly available:

size is any glutinous material used to fill pores in surfaces or stiffen fabrics

distemper is a forerunner of emulsion paint

The text of the leaflet is in the following box, together with links to more information on this website. Alternatively the text can be read by clicking the thumbnail images.

Civil Defence

How to keep it and How to Use it



Read this and keep it carefully.
You may need it.

issued from the Lord Privy Seal's Office, July 1939

TAKE CARE OF YOUR GAS MASK AND YOUR GAS MASK WILL TAKE CARE OF YOU. It is possible that in war your life might depend on your gas mask and the condition in which it had been kept.

The official gas mask, or respirator, consists of a metal container filled with material which absorbs the gas, and a rubber facepiece with a non-inflammable transparent window. Some people seem to think that this mask does not look as if it would offer very good protection. Actually it has been most carefully designed and fully tested, and will give you adequate protection against breathing any of the known war gases. But remember it will not protect you from the ordinary gas that you burn in a gas cooker or gas fire.

HOW TO STORE IT Your mask should be kept carefully. Never hand it up by the straps which fasten it on over the head. This will pull the rubber facepiece out of shape so that it no longer fits you properly. It should be kept in the special box provided, where this has been issued, but any box which is air tight, or nearly so, will do.

When placed in the box, the metal container should lie flat with the rubber facepiece uppermost, the transparent window lying evenly on top at full length. Great care should be taken not to bend or fold the window, or to let it get scratched, cracked or dented.

Keep the box in a cool place away from strong light. Exposure to heat or prolonged exposure to strong light will spoil the material of the mask and it may cease to give complete protection. It should never be held close to a fire or hot water pipes, or left lying out in the sun.


It is important to know how to put on your mask quickly and properly. You might need to do this in a hurry. To put it on, hold the mask by each of the side straps with the thumbs underneath and the inside of the window facing you. Then lift the mask to your face, push your chin forwards into it and draw the straps over the top of your head as far as they will go. See that the straps are properly adjusted and leave them so.

To remove the mask, insert the thumb under the buckle at the back of your head and then pull it forward over the top of your head so that the mask is lowered downwards from the face.


To prevent the window from misting over when the mask is worn, wet the end of a finger and rub it on a piece of toilet soap. Then rub the finger all over the inside of the window so as to leave a thin film of soap.


After the mask has been used you will find that it is wet on the inside with the moisture from the breath. This should be wiped off with a soft dry cloth and the mask allowed to dry before it is put away in its box. Do not try to dry it by applying heat.

The contents of the container do not deteriorate with age or with wearing the mask when gas is not present. But if you suspect any flaw in your gas mask you should inform your local air raid warden.

It is a good think to get out your gas mask occasionally and put it on, so as to get used to wearing it, and if you take the simple precautions set out above you will ensure that it is always ready for your protection.


In war, one of our great protections against the dangers of air attack after nightfall will be the "blackout". On the outbreak of hostilities all external lights and street lighting would be totally extinguished so as to give hostile aircraft no you indication as to their whereabouts. But this will not be fully effective unless you do your part, and see to it that no lighting in the house where you live is visible from the outside. The motto for safety will be 'Keep it dark!'

Every occupier of rooms, house or flat would be responsible for darkening his own lights. Lights in the halls or on the staircases of blocks of flats or dwellings would be the responsibility of the owner.

Of course the most convenient way of shutting in the light is to use close fitting blinds. These can be of any thick, dark coloured material such as dark blue or black or dark green glazed Holland, Lancaster or Italian Cloth.

If you cannot manage this, you could obscure your windows by fixing up sheets of black paper or thick dark brown paper mounted on battens.

Alternatively, thick curtains of suitable material will serve if they really cover the window frames with a bit to spare all round.

The simplest way of testing material, whether for blinds or curtains, is to hold up a piece against an electric bulb. If no light shows through, or only scattered pin holes of light are seen, then the material will do. If a patch of light shows through, it is no use.

Possibly you have blinds already fitted to your windows. If the material is not sufficiently opaque, you can treat it with Oil Bound Water Paint or Distemper of some dark colour. The following mixture can be applied with a brush:-

1 lb of concentrated size, 3 lb lamp black in powder form, ½ gill of god size. The size and lamp black should be thoroughly mixed and 3½ gallons of boiling water added. This quantity will cover about 80 square yards of material.

If your blinds do not fit very closely, you could paint the edges of the window panes all round with dark paint. It will of course help if you also shade your lights so as to prevent any light falling directly on the window.

Most Important - do not forget your skylight if you have one or glazed doors of even fanlights, You may find it simplest to make these permanently obscure by applying sufficient coats of some dark distemper or paint, or pasting them over with thick brown paper.

There is another thing to remember - Make sure that no light shows when your front door or back door is open. In some cases it may be possible to fix a curtain in the hall or passage to form a "light lock", but if this cannot be done, the light must be turned off before the door is opened.

Some people perhaps will only use one or two rooms at night in war time. This of course would simplify matters considerably as the precautions indicated would only have to be taken for those particular rooms. But you would have to take care not to show by mistake any light in a room where the windows were not screened, and also to see that light did not reach the window of an unoccupied room through some open door.

Do not leave things until the last, but get together the materials which you think you would need. If you wait, you might find that you had difficulty in getting what you wanted. Besides, your help is wanted in making effective the "black-outs" for the ARP exercises which are being arranged to try out our defences from time to time.

After all, it is only common sense to make our preparations in advance to meet a possible emergency. [51 - 4154]

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