Show difficulty with beld l gun high velocity in field guns is gained not only at the expense of the carriage but of the projectile the violent forces in the bore break up tip projectiles formed of the 0 ordinary r cast iron and steel has to be employed lor for shells shein a material not only more costly but less well adapted to the purpose e for which it Is intended castilon Ca cast stiron iron breaks up readily anto small pieces and allows the force of the bursting charge to have full effect while a steel shell is strong enough to resist the explosion inside it too effectually Is partially oi opened ened and does not liot fly into splinters lite other difficulties also arise in connection with fuses and these have in tact fact proved so insuperable that the great powers of the 13 cannot bo be fully utilized as regards shrapnel at any rate because a time fuse cannot be made to act at anything except ordinary ranges london saturday review |