Spons' dictionary of engineering, civil, mechanical, military, and naval; with technical terms in French, German, Italian, and Spanish

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1872 edition. Excerpt: ... „ (8 wheels coupled) 400 „ Dividing the work by the heating surfaces of the engines, we obtain the actual herse-power to the square metre. We have Crampton-s engine 4-3 herse-power. Mixed engine (typo 14)-3-0 „ „ (type 12) 3-6 Goods engine (typo 20) 2Z4 „ „ (type 15) 27 „ „ (8 wheels coupled) 2 0 „ follows from the above figures that the work in herse-power to the unit of heating surface increases with the speed, and with the dimensions of the furnace relatively to the total henting surface. Now, the speed which a locomotive is capable of maintaining, while exerting a given force, depends on the production of steam. The results of our experiments under this head will be found in Note C, and Table XXVIII. Tarle XXIII.--Greatest Value Of The Work Of Engines According To Experiment. Adhesion of Locomotives.--Table XXIV. contains trains in which a slipping of the wheels was observed. It gives the value of the adhesion of the engine when the lower limit was reached. As an example, let us take train 140, March 21, 1863; goods engine, type 15; adhesivo weight = 30,000 kilogrammes; nature of the line = gradient of 9 millimetres; temperature = 7; wet and windy.--The tractive force upon the couplings of the tender was in this ease 2850 kilogrammes: to find the total tangential force, we must add, 700 kilogrammes expended in moving the motor itself (see Table XXIV.), which gives 3550 kilogrammes. The coefficient of adhesion.. 3550 1 was, therefore, = In this case, notwithstanding the slipping, the speed was not less than 15 kilometres an heur. To realize these conditions, the engines must be provided with sand-boxes in good working order. It wLU be seen from Table XXIV. that during our experiments the...