THE recent night raids on Paris by squadrons of Gotha machines brings the question of defence against such raids before us, and adds much interest to an article by Lieut. Jean-Abel Lefranc, who, writing in the Revue Scientifique, gives an excellent review of the development of 'German bombing machines, of which the latest type is the Gotha. He also surveys the various methods of defence that have been adopted, particularly against night raids. His article is full of interesting details, of which it is only possible to quote a few, and to recommend those who are interested to-read the original in the Revue Scientifique for February 16. A detailed description of the Gotha machine is given, the overall weight being quoted as 84,000 lfo., and the weight of bombs carried as (about half a ton. The speed is,given as ninety miles per hour, and the height to which the machine can rise after discharging its bombs is 20,000 ft. M. Lefrane also states that the Gotha is likely to be replaced by a “Gotha Riesen-flugzeug,” having if our motors, and a span of about 130 ft. The “large Friedrichshafen Gotha ” which was captured in one of the Paris raids can scarcely be one of these later machines, as it only had twor motors of 250 h.p. each. The extreme difficulties of accurate bombing by night are commented upon, and the writer thinks that the demoralisation of industry is a more important result of night raids than the actual damage done-With regard to defence, camouflage, anti-aircraft guns, and attack by fighting machines are discussed, but M. Lefrane considers that all these methods are very ineffective, and that the best method of defence is to attack and destroy so far as possible the enemy's aviation centres. Commenting on extreme measures, such as total abolition of artificial lighting at night, he thinks they are a vain sacrifice to public opinion, and may even be a detriment to the Services. M. Lefrane concludes his well-written article with a picture of the bombing machine of the near future, pointing out that a machine of 1000 h.p., carrying two tons of explosives, is within the reach of modern design.
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