From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Promotional leaflet for the 'M.M.' Draughtless Ventilator, detailing its features, benefits, and expert reviews.
| Identifier | ExFiles\Box 158\6\ scan0002 | |
| Date | 22th February 1938 guessed | |
| PLENTY OF FRESH AIR WITHOUT DRAUGHTS DRAUGHTLESS VENTILATION At last you can say goodbye to draughty motoring! Here is a wonderful new device—easily fitted to any car—which ensures plenty of fresh air to the occupants at all times . . . in all weathers . . . winter and summer . . . absolutely free of draughts. This means healthier and safer motoring for you. No more headaches due to stuffy saloons—no more colds and chills caused by draughts that whistle round your ears and ankles. When your car is fitted with an “M.M.” Draughtless Ventilator (Patent applied for) all you can see are two glass panels mounted in metal channels on the forward end of the front door. The foremost panel lies parallel to the door with a slight gap between it and the door pillar. The rearmost panel projects out at an angle. Nothing very spectacular apparently! It looks like an ordinary ventilator panel—but that’s as far as the resemblance goes. In performance no other ventilator can approach the “M.M.” But don’t take our word for it. Read what the recognised motoring authorities say. WHAT THE EXPERTS SAY— (The Italics are ours.) “The Automobile Engineer.” August, 1937. “Tests of this ventilator fitted to a Daimler Fifteen Saloon were recently carried out on a day when a brisk northerly wind was blowing, and the car was driven over a circular route so that it encountered the wind at all angles. A sensitive anemometer was used to investigate the flow of air currents within the body. . . . With the rear windows closed and both front windows fully open, no draught could be distinguished by observers in the rear seat, and the anemometer also failed to show any pronounced current of air. At the same time, tobacco smoke drifted steadily forward to be withdrawn through the open front windows, and the air in the rear part of the body remained fresh. . . . In the front seats again no draughts could be detected, except when the car was moving with the wind blowing at right angles to its direction of travel. This, of course, was to be expected, but it was found that on increasing the speed of the car the effect of the side wind became less pronounced and finally disappeared. The effect of a side wind at low speed was also found to be lessened by raising the window on the lee side. . . .” “The Autocar.” June 11th, 1937. “Two or three years ago the question of ventilation of closed cars received considerable attention, but lately little or no progress has been made. Much interest, therefore, attaches to a new fitting known as the M.M. Draughtless Ventilator. . . . the Ventilator does not work on the principal of extraction . . . for it was found that ventilators having an extractor action caused draughts to be created. . . Some interesting tests were recently carried out by a representative of The Autocar. A sensitive anemometer was used to investigate the flow of air currents entering and leaving the car and passing through the interior of the body, and this instrument showed there were no draughts and that air definitely enters through the gap between the forward panel of the Ventilator and the door pillar, and leaves behind the rear projecting panel. There is not, however, a straight-through current of air from the admission area to the exit area, as the anemometer showed a neutral zone when there was no air current. In fact, the air admitted appears to be gently diffused throughout the interior. . . In conclusion, it may be said that the Ventilator fitted to the Saloon tested was very easily removable and was quite neat in appearance, although probably an even neater effect could be obtained if the Ventilators were built in when the body was constructed.” [Image 1 Caption] As you see from this photograph, the “M.M.” Draughtless Ventilator does not detract from the appearance of a car. It is no more obtrusive than an ordinary quarter-light. [Image 2 Caption] This is all that you can see of the Ventilator when the car is viewed from the front. The gap shows where air enters the body of the car. BACKED BY EXPERIENCE on The World’s most Famous Railways Behind the “M.M.” Draughtless Ventilator stands many years of experience in designing and producing ventilators for luxury rolling stock used by the leading railways of the world. A conclusive proof of the powers of these Ventilators was recently given on a coach now in regular use on the Southern Railway. A smoke bomb was fired, and it was impossible to see from one end of the coach to the other. In four minutes the Ventilators had completely extracted every trace of the smoke. Yet a handkerchief held by the open Ventilator window hardly fluttered! And it is a Ventilator adapted in design to the different bodywork and air stream of a motor car—but working on exactly the same principal—that is now offered to you, bringing healthier and more enjoyable motoring within your reach. See overleaf for details of special free trial offer. POSITIVELY NO DRAUGHTS ALWAYS PLENTY OF FRESH AIR NO MORE STEAMY WINDOWS NEAT IN APPEARANCE EASILY FITTED and REMOVED NOT AN ORDINARY ‘NO-DRAUGHT’ VENTILATOR PANEL, BUT A SCIENTIFIC SOLUTION TO A PROBLEM AS OLD AS MOTORING ITSELF SEE BACK PAGE FOR FREE TRIAL OFFER [Handwritten Number] 1247 | ||