Ce livre historique peut contenir de nombreuses coquilles et du texte manquant. Les acheteurs peuvent generalement telecharger une copie gratuite scannee du livre original (sans les coquilles) aupres de l'editeur. Non reference. Non illustre. 1886 edition. Extrait: ...if possible; furthermore, we do not say in general that it is injurious to preserve a good gun cotton air tight, but rather have frequently verified the fact that a good gun cotton, stored airtight for years, has lost nothing of its permanence, as determined by the potassium iodide and starch test; we simply believe that for all gun cotton it is better, if practicable, to store it without inclosing it air-tight. If we return now to the physical properties of paraffined gun cotton, we shall see that its only similarity to wet gun cotton is in being less sensitive to a shock than dry, on account of which property paraffining has been mainly advocated; it is, however, much more sensitive to a shock, and especially to ignition by a shock, than gun cotton with 15 per cent, water. In this connection we made the following experiment: Shots were fired at short distances from the Mauser Infantry arm against disks of gun cotton 15 cm. in diameter and 5 cm. thick. Gun cotton with 15 per cent, water stood three hits; paraffined gun cotton was ignited the third hit. The shocks to which the gun cotton designed for use in submarine mines is liable, even dry gun cotton can endure; for that purpose it will not, therefore, be necessary to paraffine the gun cotton. The charges of the Fish torpedo are an exception, as they are often exposed to the enemy's fire, but for this very reason paraffined gun cotton cannot be used. Having shown that paraffined gun cotton is too sensitive to shock, it should be stated, on the other hand, that it has lost the power of being detonated by the detonation of a primer containing 1 grm. mercuric fulminate. It can be detonated only by means of dry gun cotton. As paraffine...