A George III Mahogany Cabinet-on-Chest – Part Four

Like the chest’s, the cabinet’s carcase is half-lap-dovetailed; combining mahogany on the sides with pine top and bottom. Before assembling the cabinet carcase, trenches were cut into the sides to accommodate the adjustable shelves, and rebates were cut into the rear edges to accommodate the cabinet back.

During the eighteenth-century, cutting shelf supports from the solid was accomplished in one of two subtly different ways: The first method simply involved cutting trenches that encroached into the nominally 3/4″ or 7/8″ thick carcase sides – much the same as cutting dustboard trenches in chest carcases.

Circa 1780 mahogany secretaire-bookcase with ‘cut-in’ shelf supports.

‘Worked-up’ shelf supports required much thicker carcase panels for a more robust appearance. A rebate or moulding – the same depth as the proposed trenches – was first formed down the front interior edge of the panel, delineating a solid, unbroken carcase side panel. The worked-up shelf supports were then formed in the ancillary material in the normal way, giving the supports the illusion of being separately applied.

Circa 1790 mahogany bookcase with worked-up shelf supports.

Circa 1770 mahogany open bookcase with worked-up shelf supports.

Both these formats of shelf supports are found in ordinary and quality work alike and with this cabinet being relatively narrow (34″ wide internally), I opted for cut-in shelf supports.

The ‘cut-in’ shelf supports.

The backboards on a chest of drawers (or bureau etc.) normally comprise several pine boards butted together (vertically or horizontally) and nailed onto the back of the carcase. Although rudimentary, these simple unobtrusive backboards serve the purpose adequately. Bookcase and cabinet backboards on the other hand are visible with the cabinet doors open and ordinary butted backboards with the usual gaps and splits would detract from otherwise fine cabinetwork. Before continuing with a solution, there’s another aspect worth considering.

The carcase of a chest of drawers resists racking well; due largely to its dovetailed construction, but also in part, to its many internal structural ribs (the dustboards) and, to a much lesser extent, the drawers, but in truth, there aren’t many shearing forces exerted on the average chest. However, a bookcase or (unfitted) cabinet with loose, book-laden shelves and heavy doors (especially if glazed) – whose mass shifts wildly as they are swung open – has much less to resist racking. Nailed-on, shrunken and/or split soft pine butted backboards offer little resistance to this potential degree of racking. The solution is a frame-and-panel back.

The panelled back meets both criteria; the construction is aesthetically compatible with the associated cabinetwork and the jointed framework competently resists racking. As a bonus, the floating panels, being unlikely to split, better protect the valuable books contained within from the ingress of dust.

Circa 1790 mahogany bookcase-on-chest with panelled upper back.

My apologies; this has all been an apodictic but rather verbose justification for my adopting a panelled back for the cabinet!

The rebates in the back edges of the carcase sides were made deeper than those in the chest to accommodate the 3/4″ thick pine panel framework. The fielded panels are each made up from two 1/2″ thick boards, rubbed together with glue. Once glued and assembled, the panelled back was attached to the carcase, as tradition would have it, with screws rather than nails.

The panelled back.

Fielded panels.

Advertisements

About Jack Plane

Formerly from the UK, Jack is a retired antiques dealer and self-taught woodworker, now living in Australia.
This entry was posted in Case Furniture and tagged , , , , . Bookmark the permalink.

9 Responses to A George III Mahogany Cabinet-on-Chest – Part Four

  1. Devin says:

    Splendid writing, fascinating history, great woodworking, and… those lemons! They’re like tiny yellow Alfred Hitchcocks, appearing in the background when you least expect them.

    Like

  2. Jack Plane says:

    Hitchcocks! I like that.

    Like

  3. Jeff Aldred says:

    Thank you for this post. I really appreciate the hows, whys and the illustrations. The picture of the back of that piece is really quite startling!
    And as for the lemons – wow – they are using the F word – Frost – in many weather reports here in the Ottawa Valley.
    Again, thank you for your generosity in doing this!

    Like

  4. Kevin says:

    Quick question,were the drawers on pieces in this period lined with paper or cloth to protect the contents, or simply bare wood? Nice work by the by.

    Like

    • Jack Plane says:

      Sugar paper (traditionally pale blue) was used to line drawers, but it’s difficult to put an exact date on when the practice began as the drawers of many earlier chests would have been lined as the fashion took hold. My feeling is the practice began around 1760 and was fashionable by 1785. That’s not to say all drawers were lined from 1785; the majority weren’t.

      Like

  5. Kevin L. Schroeder says:

    Every once in a Blue Moon I find a website that so completely captures my interest, that I begin to plan to pack my bags and tools, fly to the home of the author, and plead for an apprenticeship (at slave wages), just for the opportunity visit and view this place of work, and to absorb as much as is humanly possible. Since finding your site I have been gorging myself on your past posts, stopping only for sleep, water, and nourishment. I lament I will eventually reach the end.
    Do you need someone to sweep the shop from time to time?
    Kevin

    Liked by 1 person

  6. Pingback: Picture This C | Pegs and 'Tails

I welcome your comments

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s