Monday, 19 October 2015

CAPTAIN PHILLIPS’ PATENT CAPSTAN

In the fall of 1825, Sir Edward Parry was court martialed at Sheerness for the loss of one of his arctic exploration ships, HMS Fury, which he had abandoned at Somerset Island.  He and his officers were easily acquitted, but during the trial he admitted that things might have been far worse, if not for a new piece of equipment installed on his ships. He claimed that a new capstan, Captain Phillips’ Patent, had saved the expedition from at least another year trapped in ice.

Before the 19th century, capstans were largely direct drive machinery, meaning that all of the capstan's power came from the men turning it. However, with the introduction of geared capstans, the power of these fittings was greatly increased.  Inventors had experimented with these “improved”, or “power”, capstans since the mid-18th century, but poor manufacture of the gears appears to have hampered their reliability. (1)

Charles Phillips, then a commander in the Royal Navy, believed these powerful new capstans had the potential to revolutionize the way ships were moved using lines and anchors (critical for saving grounded vessels). In 1817, he submitted a plan to the Admiralty outlining a method for using them, but without a reliable power capstan, the plan could not be implemented. In 1819, he again returned to the Admiralty, but this time with a patent for his own improved design (Patent No. 4394).



An 1854 update of Phillip's 1827 capstan patent. 

His patent used planet gearing within an encircling gear ring to increase the power of the capstan by a factor of three. The gears could be rapidly engaged or disengaged using four drop pins. With the upper pins engaged and the lower pins removed, the capstan operated in direct-drive mode. When the lower pins were engaged and the upper pins were removed, the gear drive was enabled and the power was increased (and the speed decreased).

It seems the Admiralty began to adopt the new design, albeit in a limited manner, after 1819. Phillips was given a command as a result of his invention, and he continued to command vessels while filing new patents for nautical inventions. (1) John Richardson named an island after Phillips in 1826 and in 1829 he was nominated a Fellow of Royal Society, both largely on the popularity of his improved capstan.

Seeing the potential for using them in ice conditions, Sir Edward Parry installed Phillips’ Capstans on both Hecla and Fury for his third voyage to the Arctic in 1824.  He gave the highest praise to the devices, which he used to literally haul the ships through the ice.

Parry wrote:

“The strain we constantly had occasion to heave on the hawsers, as springs to force the ships through the ice, was such as, perhaps, no ships ever before attempted; and by means of Phillips's invaluable capstan we often separated floes of such magnitude as must otherwise have baffled every effort.” (2)

He continued, in a footnote:
“I cannot omit this opportunity of expressing my admiration of this ingenious contrivance in every trial to which we put it in the course of this voyage.” (3)

It seems Parry’s endorsement carried great weight with “…the Lords of the Admiralty, who, with a laudable zeal for the service, gave instructions that all the vessels of his Majesty's navy are in future to be fitted out Capt. Phillips's new capstans.” (4) It is no surprise then that Phillips’ Capstans were installed in Terror and Erebus in 1839 for Ross’ Antarctic voyage. 

The 1839 profile of Terror and Erebus clearly shows a Phillips style capstan installed on the upper deck, and the 1848 profile of HMS Investigator provides a virtually identical illustration. Unfortunately, the draughts are missing many crucial details, and therefore I was forced to conduct further research to create accurate plans. Like nearly every part of my HMS Terror project, this proved to be far more difficult that I originally assumed.

Because of the popularity of Phillips’ design, myriad updated versions of these capstans were constructed over the years. Besides the original patent drawings, several plans for different versions can be found in the historic literature. Additionally, several demonstration models have survived in museums, all with slightly different designs. Finally, a Phillips designed capstan still exists on HMS Unicorn (1824), and it is also slightly different from the contemporary models and plans.  



A merchant vessel version of Phillips' capstan, dated to 1837. This
configuration was very similar to that used on HMS Terror

I started my reconstruction with an assumption that the basic profile, shape, and features of the capstan were accurately depicted on the 1839 profile plans (their consistency with the Investigator plans, as well as their overall accuracy, provides good support for this). Using the 1839 drawings as a base, I determined to add details from sources dated as closely as possible to 1839.

A primary source of information comes from the 1854 Encyclopaedia Britannica (5), which contains a detailed plan of a two-capstan (upper and lower deck) version of Phillips’ 1827 patent (No. 5505), specifically for Royal Navy ships. The plan differs little from Phillips’ original 1827 patent, though it shows a gear mechanism placed below the pall rim and a less robust gear plate, both common traits in later designs. Fortunately, an 1837 plan of a single capstan for a merchant vessel (recall that Terror and Erebus were based on merchant designs) exists (6), and I drew crucial information from this plan. It accords very well with the 1854 and 1827 plans, although the gear mechanism and other details would not fit the plank and beam arrangement shown on the 1839 Terror and Erebus plans. The notes accompanying the plan indicate that Royal Navy models were slightly different than this plan, and hence I believe the 1854 plans, which are consistent with the planking arrangement on Terror, are likely to be most representative of the overall gear design.

Further valuable information about the gear design and gear plate design, as well as information on the pawl configuration and rim, comes from contemporary models. A beautiful 1827 model single capstan exists in the Science Museum collection. Two additional models of the 1819 versions of Phillips’ capstan can be found in the Rijksmuseum in Amsterdam.

The capstan on HMS Unicorn has been heavily modified (the upper even has table lamps built into it), but it provided valuable construction information, especially on the appearance and construction of the barrel and whelps on the upper capstan, and the gears and gear plates on the lower capstan. Believing that additional robustness would have been necessary, I added full thickness chocks on the upper part of the capstan to my plans and model, matching those on HMS Unicorn’s upper capstan. This is the only detail of my plan not consistent with the 1839 Erebus and Terror sheets.


An 1839 era Phillips capstan, as I believe it may have been 
configured for use on HMS Erebus and Terror.


Constructing the model of Terror’s capstan began by transforming my technical drawings into construction plans. Given how intricate the resulting construction plans were, I decided to begin construction by using a laser cutter at my local library.


Cutting the capstan components on an Epilogue laser cutter. 

The completed pieces. 

Vellum was added to enhance the joints of the capstan.  

The assembled capstan before sanding. 

Sanded to shape. 

Drilling the bolt locations. 

The completed drumhead. Some Phillips' capstan models show lined sockets, so I added boxwood liners.
I admit that it was primarily an aesthetic choice.

I cut the drumhead plate from an unused pipe fitting which I flared to the right size.  

I filed a lip into the plate by hand. 

I cut the pawl rim (ring) out of brass plate using a jeweler's coping saw.

I filed each stop by hand, after carefully scoring the brass. 

The pawl rims were each made from pipe fittings flared to the precise diameter. 

The pawl rim prior to soldering and sanding. 

The piece following soldering. I used  copper solder for the first time on this piece - despite being very dirty, it worked well. 

To maintain the proper curvature, I cut the pawls from a copper fitting. 

The pawls cut roughly to length. 

Bolt holes were drilled before shaping. 

Each pawl was filed and shaped by hand. 


The completed pawl rim (ring) and pawls. Two traits unique to Phillips' capstans can
be seen here. First, the pawl rim was bolted through each stop, rather
than in the spaces. Second, Phillips' capstans had between six and
eight pawls, while earlier models typically had four. 
 
The pawlhead. 

The completed pawlhead with the top plate soldered in place. Contemporary models show that the pawlheads on
Phillips' capstans were made entirely of iron. 

Dry fitting the metal pieces. The pawls need some thinning here. 

Pieces prior to finishing and assembly. 

Blackening the metal parts. 

The metal pieces after blackening, buffing, and sealing
(I use Krylon matte coat as a sealer). 

The completed capstan. The wooden pieces have been treated with Minwax wipe-on poly. 

Detail of the pawl rim and pawls. 

The drumhead (the drop pins indicate it is in direct-drive mode). 

Detail of the lower drop pins (I couldn't find scale chain small enough to model that feature). 

Mini-Crozier inspects his capstan, recalling his good times with  Parry. 

Of course, one further Phillips' patent capstan is known to exist – on the wreck of HMS Erebus. Parks Canada’s recent video tours show that it is heavily damaged and that it is very obscured by the growth of marine life. How it compares to my plans and model is impossible to tell from the video, but hopefully my model isn't too inaccurate. If the historic plans are any indication, any differences should be quite minor.

Footnotes:
1 Harland, John. 1999 Improved Capstans. Nautical Research Journal 44(4): 214-220.

2: Parry, Sir William Edward. 1826. Journal of a Third Voyage for the Discovery of a Northwest Passage- from the Atlantic to the Pacific, Performed in the Years 1824-25, in His Majesty's Ships Hecla and Fury, Under the Orders of Captain William Edward Parry, R.N., F.R.S., and Commander of the Expedition. John Murray, publisher to the Admiralty, and Board of Longitude. Page: 14.

3. (ibid, Page14)

4.  The Mirror of Literary, Amusement, and Instruction. 1825.  Page 451.

5. Encyclopaedia Britannica. 1854. Capstan. Pages 128-129, Plate CXLVI.

6. American Magazine of Useful and Entertaining Knowledge, Volume 3.Nathaniel Hawthorne, Elizabeth Manning Hawthorne, Boston Berwick Company, 1837. Page 203.

11 comments:

  1. Great work. Your attention to detail, especially on such a tiny thing, is commendable! You really know your materials and the documentation of your work is so thorough.
    Is it eventually going to get handspikes too? ;) (Okay, it's probably pointless, I know they were never in the capstan, except when needed)

    ReplyDelete
    Replies
    1. Hi Kristina, thanks very much for your comment. Yes, I'm making the capstan bars as we speak. I jut need to decide where they were stored on that very cramped deck!

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  2. The fineness of your research and construction is simply exquisite. It's amazing how vital just one piece of equipment can be on a polar voyage.

    ReplyDelete
    Replies
    1. Thanks for the kind comment, Glenn. I do think these were pretty important at times, especially in the Arctic. I'm still trying to figure out if Back had one installed on Terror in 1836 years before Ross' Antarctic voyage.

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  3. Great work !

    While the big capstan certainly would have been used for the cable and anchors, would either ship have had smaller capstans ( or winches ) to be used to manage the sails ?

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