World’s First Global Maritime Competition
What Are Ship Portholes?
When one travels by ship, the ship’s windows are the most important and striking feature on a ship’s side. The ship’s windows are known as portholes, shortened form of the word ‘porthole window.’ Portholes, however, are also not just a part of ships but are found in submarines, airplane and spacecraft.
Sometimes ship portholes are known as ‘side scuttles’, mainly because they are located on the side of a vessel. Today, they come in different styles to match a ship’s interior design. Sometimes they are used as a frame or a decorative piece on a small boat or a yacht.
Understanding Ship Portholes
Portholes have been a part of ships since the beginning. They have retained their circular form and are unique compared to windows in other means of transportation.
The portholes are designed so that when a ship cruises into the middle of the seas, one can get the best possible ocean view from the ship’s porthole. For this, the height of the portholes is strategically decided, and one end of the portholes is hinged.
A porthole was initially constructed to be a window in those areas of the ship where airing was a significant problem. This allowed light and fresh air to enter those parts. This construction pattern immensely helped the people working in these areas to work continuously for long hours. However, later on, portholes came to be built on every room and cabin on the ship.
Construction of Portholes
The materials used for building ship portholes are stainless steel, aluminium, brass, bronze, and iron. The glass used in the portholes is compulsorily made involving sand. Making glass is known as sand-casting; silica sand is the primary material for this process. To make the glass, a mixture of silica, lime and ash is mixed, heated and cooled until the right consistency of glass is achieved.
The process further involves constantly re-heating the mixture in huge furnaces so that the glass reaches its appropriate thickness. Then this mixture is laid on top of a melting tin, ensuring that the proper shape of the glass is achieved. The glass is finally cooled. This process is called tempering, providing the glass does not break or shatter.
Materials such as brass and bronze are preferred over iron and steel because iron rusts because of seawater, and steel bends after a certain period. Brass portholes and bronze remain effective for a longer time.
The glass is put in a metal cover or steel frame with a shaft or screw to keep it firm. Hence, the watertight glass cover protects the ship windows from breaking or damage.
A ship’s porthole measures around two feet in diameter, while its weight can go up to around 100 pounds. Ship portholes are generally because of the durability factor. They offer resistance not only from sunlight but also from sea and rainwater. The heaviness of the ship’s portholes also ensures that no damage is caused at any time on the boat.
Portholes have become quite trendy. One can find numerous antique maritime portholes for decoration purposes. But just because of their utility, they are still used extensively on ships worldwide.
Frequently Asked Questions
1. What is a porthole?
A porthole is a small circular opening or a glass window in a ship, aeroplane, submarine or spacecraft. They are bound in a frame and allow one to see outside.
2. Why are ship portholes round?
A round shape is preferred to maintain a vessel’s structural integrity. Oceans and seas put immense pressure on the ship’s body, and square or rectangular windows are more susceptible to stress and might become weak at the corners. A circular window is tougher and also suits the overall design.
3. How thick is porthole glass?
Portholes have a varying range. Some are several inches to over two feet and weigh from several pounds to more than a hundred pounds. Much of their weight is of the glass, which should be less than two inches thick for safety purposes.
4. What are the materials used for making portholes?
Uusally, materials like stainless steel, brass, bronze, iron and aluminium make ship portholes. Also, the glass used for making portholes is mandatorily made of sand, and the process is called sand-casting. The primary material used in this process is silica sand.
5. Can one open a porthole on cruise ships?
The word port is derived from the french word Porte, meaning door. In today’s cruise ships, most portholes only open slightly, and the others are usually built for design and for letting natural light inside.
You might also like to read-
- 10 Points To Check While Inspecting Accommodation Areas On Ships
- What is Maritime English and Why Is It Important?
- Different Systems on a Naval Submarine
- Maritime Accidents: The Sinking of Britannic Hospital Ship
- What are Rogue Waves?
Disclaimer :
The information on this website is for general purposes only. While efforts are made to ensure accuracy, we make no warranties of any kind regarding completeness, reliability, or suitability. Any reliance you place on such information is at your own risk. We are not liable for any loss or damage arising from the use of this website.
Related Articles
About Author
Shilavadra Bhattacharjee is a shipbroker with a background in commercial operations after having sailed onboard as a Third Officer. His interests primarily lie in the energy sector, books and travelling.
Disclaimer :
The information on this website is for general purposes only. While efforts are made to ensure accuracy, we make no warranties of any kind regarding completeness, reliability, or suitability. Any reliance you place on such information is at your own risk. We are not liable for any loss or damage arising from the use of this website.
⚓️ Enhance Your Knowledge. Prevent Accidents. Stay Safe at Sea.
1. eBooks for Engine Department
Master machinery operations, troubleshooting, and safety procedures with expertly written guides tailored for marine engineers. Prevent costly breakdowns and onboard accidents through practical knowledge.
👉 Explore Engine Department eBooks
2. eBooks for Deck Department
Sharpen your seamanship, navigation, and cargo-handling skills with real-world case studies and practical insights designed for deck officers and cadets.
👉Discover Deck Department eBooks
3. eBooks on Electrical Fundamentals & Issues
Understand marine electrical systems, identify potential faults, and prevent onboard electrical failures with step-by-step explanations from industry experts.
4. Pocket Guides for Quick Reference
Compact, handy, and loaded with essential checklists—perfect for on-the-go reference during operations and emergencies at sea.
5. Combo Packs to Save Big
Access multiple expert eBooks at discounted prices. Ideal for professionals seeking complete safety and operational knowledge across various ship departments.
6. Digital Maritime Courses – Learn at Your Own Pace
Upgrade your competence with Marine Insight Academy’s online courses. Learn from industry professionals anytime, anywhere, and become a safer, smarter seafarer.
Subscribe To Our Daily Newsletter
By subscribing, you agree to our Privacy Policy and may receive occasional deal communications; you can unsubscribe anytime.
Stunning, Thanks for the excellent outline and helpful hints.