PRESENT DAY STATUS OF THE ART. 59 



7. Cruiser sterns for twin or triple screw ships are decidedly to be preferred 

 to the old type of counter. 



8. Appendage resistance is generally very small in single-screw merchant ships, 

 but cannot be watched too carefully in other and faster types. Enclosed shaft 

 bossings are generally preferable to open brackets. 



9. We are not yet ready to advocate the general adoption of anti-rolling tanks. 



10. Progressive trials of important ships should always be made and enough 

 cargo ships thus tried in load condition to check up model tank and propeller per- 

 formances. This could well be emphasized towards oil tankers, on account of the 

 ease with which they can be loaded; other types of ships of similar lines would 

 thus also benefit. 



11. Flared bows above water are now well established and undoubtedly im- 

 prove performances at sea. 



12. Large apertures, propellers well back from the post, and ability to unship 

 propeller without withdrawing the tail shaft, are to be strongly recommended. 



13. Competitive bidding tends to a cheaper first cost at the expense of subse- 

 quent performance, which leads to full models and poor time-keepers. 



14. In conclusion I should like to point to the plea for adequate trials, made 

 by Sir A. Denny in his presidential address before the Institute of Marine En- 

 gineers only last September. 



