318. Inevitable accident is where a vessel is pursuing a lawful avocation in a lawful manner, using the proper precautions against danger, and an accident occurs. ‘The highest degree of caution that can be used is not required. It is enough that it is reasonable under the circumstances; such as is usual in similar cases, and has been found by long experience to be sufficient to answer the end in view,—the safety of life and property. The Grace Girdler, c Wall. 196. 19 L.