The Burroughs Portable adding machine

The Burroughs Portable adding machine - the type was introduced a 100 years ago, my specimen was manufactured 97 years ago. Having now had it standing for several weeks after re-filling the dashpot to check for any signs of leakage (none!), the repairs to this machine have now (probably) been succesful - fixed :)

The direct-subtracting Class 9 was introduced a bit later than the Class 8 adding-only Portable. The range was designed from the start to be modular, enabling many variations in capacity and features. (Similar to how the 1921 Dalton Super Model range was envisioned.) My particular machine is a Portable of Style 90802: 9 for direct-subtraction, 08 for the 8-column capacity and 02 for hand-operated with 12.5" movable wide carriage.

(rechnerlexikon.de)

After 97 years the anti-glare crackle lacquer is worn away in spots, but it definitely is the wide carriage style. It is massive too.

Sometime in the late 1920s the Burroughs company issued a marvellous advertising book to promote the Portable range. Today this publication is scanned and available via the Archive.

The book gives a fascinating insight in the use of the machine and its selling-points. Note that in 1928 a market survey in the USA found that about 15% of sales were repeat purchases - most adding-machine business was to sell a machine to a first-time user automating existing manual work.

The book repeatedly touts the many advantages of this new portable design; it is only slightly larger than a letterhead!

Technically, that is true. Nevertheless, it does have rather more 'presence' on a desk than the letterhead.

The portability is emphasized on several pages; how easy it is to carry from desk to desk, take it on a business trip. The girl is carrying it under her arm with a seeming nonchalance.

At 19 pounds it indeed is portable. Especially when comparing to the Burroughs Class 1 behemoths or even a Class 3 machines. Nevertheless, it is a hefty chunk of metal.

Another way to look at this adding machine, here the Portable placed next to an Underwood 5 standard typewriter.

Looking at the heavy presence of the Burroughs Portable, note that Underwood did not advertise the No. 5 as 'portable' - the Underwood Portables of 1925 were significantly smaller and lighter. Portability definitely had a different meaning for adding machines.

Introduced with a basic price of 100 dollar it was of course an expensive item, but remarkably low-priced for a quality brand adding-listing machine. It effectively forced Dalton to lower their entry price from 125 to 100 dollar in response. (Dalton needing to create the 'Special' monochrome-only machine in a different finish to justify this new price-point.) It also gave Burroughs an answer to the increasing competition from Wales, Barret and others, many marketing their machines explicitly as being portable. 

A Class 8, basic Style 80801 would've been 100 dollar. A Class 9 with wide carriage would have cost significantly more - probably around 170 dollar in 1928.

Whichever variation, all were solidly built - made by Burroughs in Detroit:

And after almost a century, this particular machine again works fine - a quality product!

With movable 12.5" carriage, able to take an A4 sideways. Also with a roll-holder to optionally print on a standard adding-machine paper roll.

With direct-subtraction - figuring out its age.

And in side-profile. For its period it is a clean-looking and modern machine.

The major difference with the competing Dalton machines; it has a full keyboard like all Burroughs machines. Buttons.

Magnificent engineering! - celebrating its 100 year anniversary this year :-)

Blickensderfer 5 typewriter - ready

The Blickensderfer 5 typewiter that was in a bit of a state (and missing several bits) is now again presentable and in its transport case.

Taken out of its case, it is complete, clean and even functional.

This machine probably dates from 1906. Instead of a metal plate with patent dates, has a gold decal shield with patent dates on the side.

The replacement carriage-release bail as well as the paper-tray rack are made from knitting-needles. A new 3D-printed carriage knob fitted, replica of the original pattern. For proper paper-handling, a replica was made for the missing ruler as well. 

From browsing The Typewriterdatabase, number 5's of this period should have a nickel-plated ruler, rounded edges with a numbered scale. Number 7's have a blank ruler. Early machines straight corners. Later models, i.e. the Rem-Blick show a black ruler with the scale in white. Being uncertain of how the result would come out, made a replica ruler for each of the possible variants - to see what would be achievable/acceptable and not look too out-of-place.

Fortunately, the scale lettering came out quite well and accepting a spray-painted brushed-nickel appearance instead of proper shiny nickel, the nickel-scale variant was fitted. To mount this and also replace the refreshed feed-roller, again the carriage was taken apart.

Viewed from normal 'use' distance, the ruler is not too jarring. More importantly, it functions in guiding the paper over the platen. (The new keys also blend in fairly well, may yet be replaced by slightly improved specimens.)

Outcome of re-building the wrecked little Blickensderfer; a presentable and functional Blickensderfer 5 typewriter.

It is now quite usable to type a letter or two. The roller-inking and typewheel mechanism is however much more temperamental than a typebar+ribbon system. Using the Blickensderfer next to e.g. an Underwood 5 the difference is very noticeable - the Underwood is so much more robust and forgiving than the Blickensderfer, not even mentioning its speed.

The Blickensderfer on the other hand is amazingly compact, offers endless variety in typefaces and easily swaps color and simply looks 'cool'. With some care and adapting to the touch and rythm of the machine, it is really usable and able to produce decent work too.

Ingenious little machine! 

Turning of the Screws - adjusting the Blickensderfer

This Blickensderfer 5 typewriter was out of adjustement from severe knocks to the frame - so it was unavoidable to attempt to re-adjust the typing mechanism. Adjusting the typewheel mechanism with its several set-screws dotted around the machine is somewhat intimidating, further made interesting by the bent-parts taking some adjustments out of the range of the set-screw.

Even though intimidating, there logically has to be a way to simply converge on a properly adjusted Blickensderfer step-by-step. The factory turned out hundreds of machines per week - there will have been a 'recipe' for the adjuster to efficiently adjust a machine. (Some of the training material or instructions for the factory would have been great here.)

The basic method of selecting the right rotation for a specific key is fairly straightforward. As nicely illustrated in below sketch, the wheel is rotated by the difference in deflection between bars G and D as actuated by the stepped-section of the key-lever. 

(G. Tilghman Richards - 1938)

The bar D is actuated first, rotating the wheel as it rotates one "quadrant" C downward via the transmission of the geared-prongs (essentially very small sections of large gear-wheels). The rotation stops when the keylever also touches and starts actuating the bar G that causes the whole typewheel stack plus the other quadrant B to start moving in sync with C. Also moving quadrant B is part of the trickiness - this is timed via the set-screws on the base of the mechanism. Quadrant B is actuated via a prong (with set-screws) that is part of bar G.

Another trick is that the static quadrant is locked at first, to prevent any slippage or being pulled along as the wheel rotates. It is held by the hook shown in the diagram; only by actuating the bar D corresponding with the quadrant is this hook pulled out of the way to allow movement. 

The start of ajusting probably was to set the set-screw for each side to to start touching the other side's prong just as the universal bar G starts to move. That means for the right side of the keyboard, the left set-screw must be set to ensure the left prong moves in-sync with the central 'universal prong' and vice versa. Likely that is the start of adjusting the base. The next step is to check that the least-deflection keys (here T and E) are balanced. And when the top-assembly is installed, to screw inward just enough for the lock to be released. I.e. for the unlock of key E on the right-side of the keyboard the left screw (red) and vice-versa.

On this banged-up specimen the left-side could not be brought in-range. At the maximum setting, the letter E would not rotate before the universal bar G stopped it. To fix without attempting any more bending, bar D was padded with copper shim to 'cheat'. This is too soft and not durable, but it'll hold for now. 

The three set-screws on the top-assembly regulate the wheel locking-moment and release - when the balance of T and E is right and the opposing quadrant is unlocked just-in-time, then the centre screw (yellow) sets the range of the end-rotation. This then adjusts so that the largest-deflection key (Z and J) register correct.

Another trickiness of the mechanism is a prong that locks the typewheel in its rotated state from below. Probably its function is to prevent any smudging from the wheel starting to rotate back before it has fully left the paper. When the typewheel stack is rotating back upwards again, this lock needs to be pushed out of engagement. The right set-screw (purple) adjusts the timing via a bail to trigger this unlock. It is sensitive. (The left set-screw is an imposter; this merely is the mounting srcew of a spring.)

After a lot of time staring at the mechanism and imagining what the steps would've been, this little Blickensderfer 5 is starting to make sense again!

There still are some characters that are at the edge of their range (wrong character about 1 in 10 times) and the unlocking is likewise at the edge. I.e. when depressing the lowest-rotation character, a clear resistance is felt from the other side's quadrant slipping off the locking-hook. Even though this adjusting mostly worked, there are likely more details/tricks (that were well-known in Stamford 120 years ago). Probably more small tweaks as the machine 'settles in'.

Another aspect is that the adjustments and details of the wheel mechanism were changed over time by Blickensderfer - this adjustment worked on a 1905-ish No. 5, but an older or newer machine or e.g. a No. 8 are likely to be slightly different.

Result is that this project machine has now cleared its biggest hurdle to again becoming a typing machine! :-)

Cleaning the Blickensderfer 5 head-assembly (writing cipher)

The head assembly of the Blickensderfer typewriter is a bit daunting to take apart completely. For this one, the main pivot-rod was left in place, but the other bits were removed for proper cleaning.

The ink-roller bracket was completely bent out of shape and the thumb-screw for adjusting spring-tension was also bent badly. Fortunately it was possible to bend this back (a bit) without snapping the threaded rod. The fact that these parts were both bent so severely means that the top-casting of this Blickensderfer 5 got a very nasty knock at one time.

Most of the paint-splatter could be removed without damage, but the thick lacquer had also been chipped in many spots.

To make these chips less noticeable, a method to mask these was tried. First filling-in with black enamel paint.

And then followed by sanding the filled-in areas smooth and level with the surrounding paint, using fine, wet P400 sandpaper.

That was then followed by a polishing (car-polish for black) and given the sewing-machine oily-rag treatment.

Definitely still visible as damaged areas, but much less noticeable from a distance. A different, high-gloss enamel lacquer could have been used to better match the surrounding gloss. Nevertheless, the whole appearance is deemed good enough for now. (The typewriter is 120 years old, it's allowed to have some blemishes and show wear.)

The whole top assembled again and placed back onto the machine. Then popped-on a brand-new Italic typewheel (Blickensderfer Mfg Co catalogue number 440) plus a new ink-pad and to see if it works!

Yes, the machine types! 

However; the printed characters are not what's on the keys, and not always the same characted for a key either. (That was the 'w' that was pressed repeatedly, not the 'f'.) It's now a bit like a cipher machine.

From checking how the machine is out of adjustment, this is almost certainly caused by the top-casting being bent backward. This threw the wheel-locking out of adjustment and made it unusable. If the fall/knock happened long ago when it was still in use, it would definitely then have been 'retired' to the shed, basement or attic.

A quick check of the adjustment screws of the base also showed-up that the geared-prongs of the actuating bars also are bent. These bars are now impossible to adjust to be in-range with the adjustment screws.

Much more puzzling to be done! The little typewriter shows it can write, now only to make it write sense :)

Case for the Blickensderfer 5 cleaned up

The most-common type of wooden case for the Blickensderfer 5 typewriter is a plain wedge-shape carrying case with a leather handle. From pictures available online, these cases seem plain wood - or at least they look plain, unfinished wood.

This specimen looked fairly bad, but underneath the hinges a spot of original finish remained - looking almost as if it'd been lacquered. The exposed, weathered surfaces however didn't look as if they'd ever been lacquered. Adding that almost all cases seen online look unfinished - perhaps these cases were originally not lacquered but oiled wood.

Whatever it originally was, this one was first sanded down to remove all water-staining and mold-spots - down to bare wood and made smooth. At least, smooth to the touch, if not to the eye. 

Where the case was coming apart, the cracks were glued and clamped - left for a day to fully set. In the meantime, the brass fittings were cleaned and given a polish.

Then linseed oil was applied and rubbed with a soft cloth. This really darkened the wood again and made the grain stand out. It then becomes noticable that the sides are made of single pieces of wood, split over top and lower half of the case.

The fittings mounted again and a new leather strap cut from 3.5 mm saddle-leather was fitted. The handle-brackets originally were nailed onto/into the wood, now instead fitted with screws.

Structurally fine, clean and still looking its 120 years.

The inside only cleaned lightly with a damp cloth - and the pencil scribbles on the screw-cap were removed (rubber eraser). The rubber machine buffers will be replaced when the machine is ready for a fitting - to ensure a snug fit. 

The case is ready to hold a Blickensderfer 5 typewriter again! (being assembled...)

Book with numbers and advertising therefor

Numbers - a book full of them.

This is a book full of multiplications, one large table.  It was advertised for in a technical handbook shown below. This was aimed at engineering students (MTS students; Middelbare Technische School), for the year 39-40, and itself is filled with mathematical and technical information as wel as practical information on many technical components of the day. 

Amongst the several sponsored sections and adverts for all the things a starting engineer or machinist might need, here is the one for a calculating- or arithmetic-dictionary, the Rekendictionnaire by W. Vriesendorp.

The advertisement clearly explains what it is; a bound book with all multiplications of 1 to 999 by 1 to 999. A quote of an NRC newspaper review: "Het geheel is het product van een merkwaardig geduld en nauwgezetheid..." - The work is the product of a curious patience and scrupulousness. The line is hard to translate, but is neatly phrasing it as a product (i.e. a multiplication result) and might have a hint of irony, perhaps sarcasm?

That did not however deter Vriesendorp from using the quote in advertising his book of tables.

(The ad on the other page recommends spending a few Guilders more for the quality of a Richter drawing set - recently did :-)

Such books of mathematical tables were fairly common, every region or country having its own variant. Mathematical tables 'proper' would at least have a table of logarithms. These simple books with multiplication-tables are a bit of a 'subset' of the category; but multiplication-tables still had a market, even when the 'proper' books of tables were already largely displaced by sliderule or calculator.

(Advertising in a technical handbook might seem logical at first sight, however for the technical audience almost all calculations can be done with a sliderule - rarely needing nore than 3 digits significance. But in tallying partslists, extending bills etc, there might be a need.)

So a multiplication-tables only book, and only for the Dutch market, the Rekendictionnaire can still be found for sale second-hand:

It is indeed a hefty, bound book about A4-page size weighing in at almost 2 kilos. Published in 1937, it claims to contain 'tables' - or rather, it contains one large table.

In one page is the foreword and the full instructions on how to use the book to do multiplications. Not just of numbers up to 999, but also how to break-up problems to be able to do larger products. There would have been a loose-leaf insert with more examples, that sheet was however missing in this specimen.

The book itself is then pages full of numbers (quite the nightmare to set and proofread, I imagine). 

The numbers 0 to 9 are printed on the side to assist in opening it near the right number.

The book does not reduce the duplicates, i.e. it contains the answer for 28 by 231 both on the page of 28 (6468) as well as for 231 by 28 on the pages of 231 (6468). 

Looking up an answer is pretty easy; finding for example the product of 495 and 617. On the page of 495, look in the 600s column and find in the 10s row the answer 305415 printed behind 617.

Doing a quick check on a contemporary ~1940 pinwheel calculator; it of course arrives at the same answer :) 

The book is less capable than the calculator, but at Hfl 12,50 it only cost a small fraction of the price of a calculator that would have cost several hundred. As a way to do multiplications rapidly with a precision of more than 3 digits (sliderule), this book could have seemed an attractive solution.

Carriage of a Blickensderfer 5 progress

The carriage of a Blickensderfer 5 typewriter is a relatively simple affair, as is shown on several pages online. One end of the baseplate casting had been quite badly rusted, but overall the parts came out reasonably clean and usable.

From point of view of the restorer/repairer, there are two unfortunate aspects to the Blickensderfer carriage. One is that the main brackets are held with dowel-pins in a delicate casting. The other is that to remove the platen, pretty much the whole carriage and side-brackets need to be taken off.

The pins fortunately came out with precisely applied careful hammering without any mishaps. When putting it together again, these pins will not be used. Instead, a 2.5mm rod is formed to be a springy-fit through the holes and keep the pressure-brackets in place (arrow).

One of the front paper-guiding springs was broken. Using the remaining original as guide a brass replacement was cut (card as flat template).

Brass is nowhere near as strong or springy as the steel original, but it'll do for light use. It will also be assisted by the ruler (when such is re-created too and fitted). To make it blend in, the brass spring was nickel-plated. (Nickel at the plus, part to be plated at minus, electrolyte from vinegar with 10% salt and 10% sugar. Around 5V works fine at small distances.)

Another broken item was the platen-knob. Again very fortunate that still half a knob remained, so that could be used as guide to make a new platen-knob.

With a scrubbed and polished-up platen (slate-hard), the carriage fits and actually moves when space is pressed. The feed-roller will need re-covering later on, but for now is serviceable. Strangely, the feed-roller is still soft and rubbery, but the platen is rock-hard.

The missing paper-rack and more importantly the carriage-release bar were re-created from 2.5 and 3 mm steel wire. The carriage-release rod should be ~3.5 mm rod, but the 3 mm was difficult enough already to bend in shape. Knitting needles from the thrift store again are a great source of nicely straight polished rod material.

A very neat feature that hadn't been apparent to me initially, is that the chamfered wooden blocks at the back of the case press-in the carriage-release bar when the machine is placed in the case. This automatically dis-engages the escapement when the typewriter is placed in its travel-case; very clever!

But then, the Blickensderfer overall is a very clever machine :-)