Monday, July 20, 2015

Parker colored Bakelite pens

Today's second under-our-noses discovery was in another issue of Parkergrams, dated September 1918, also in the PCA Library. Key passage:
" . . .we are now making the Bakelite in a translucent barrel in two or three very beautiful colors. It has been practically impossible for use to get any more of the Ivorine [this casein-based plastic was imported from France], so we have developed two or three colors in the Bakelite. A very pretty shade of green, for instance, one or two shades in red and pink that are really very beautiful."

Green and pink Bakelite Parker eyedropper-fillers . . . has anyone found one?  I'll have to review my photos of the Parker Archives -- perhaps some of these have been sitting there, misidentified as Ivorines.

Mystery pen: Parker pneumatic-filler

Those of us who research pen history often bemoan the gaps in the available documents, yet one can still stumble across the most amazing things in documents that have been available for years. Today's discovery was in a copy of Parkergrams -- Parker's newsletter for dealers -- that has been in the PCA Library since the days it consisted of photocopies, probably a good 25 years if not more.

This entry, pencil-dated February 1917, announces a new pneumatic-filling economy-line pen, to be called the "Parker Finger Filler". The description of the pen is uncanny, as it sounds just like a post-1926 Chilton, though much too early. In fact, the only pneumatic-filling pen of such an early date that fits the Parkergrams description is the Bender, patented in 1906 and profiled here. Bender died in 1912, and it seems his pen company did not long outlive him. This could fit the Parkergrams statement that "We have at last perfected and acquired the patents covering a device that is entirely new in the way of a Self Filling Pen."

As yet, this is the only mention of the "Finger Filler" that I have been able to find. It is promised that "In the next issue of Parkergrams a further announcement will be made and cuts [engravings] shown of the pen." Unfortunately, the next issue in the PCA compilation is dated illegibly, and the one following is dated June 1917. Perhaps some mention may be found in the missing issues, but for now Parker's pneumatic-filler remains an intriguing phantom.

UPDATE: Richard Binder has pointed out that Julius Abegg's US patent 1,134,936, issued April 6, 1915, would be a more likely basis for the Finger Filler's design. The "nickeled metal tube" plunger described in the Parkergrams entry corresponds much more closely to Abegg's specification than to Bender's.

George Rimakis has also noted the survival of at least one experimental Jack-Knife Safety with an Abegg-style filling system, and has shared the photo below. This pen is a #5-size, so considerably larger than the three models mentioned in Parkergrams.

UPDATE #2: Dan Zazove has pointed out William Edgar Moore's patent, US 1,801,635, filed March 15, 1929 and issued April 21, 1931, assigned to Parker. Although I am baffled at how the Moore patent could have been approved, given that it is a virtual duplicate of Abegg's, it does complicate efforts to associate the pen shown above with any one patent.

Thursday, July 2, 2015

Measuring nib flexibility

Once buyers started bidding up pens with flexible nibs to unprecedented levels, sellers began to cash in by overstating the flexibility of their wares (related posts here and here). This has in turn renewed interest in establishing some sort of grading scale for flexibility.

Establishing any sort of standardized flex grading system will not be easy. At minimum, there would have to be one scale indicating the range of line width variation, and another scale indicating how much pressure is required to make the nib open up. Unfortunately, I can think of no practical way to prevent the first scale from being subjective and inconsistent. Maximum line width for a given nib will differ greatly depending upon whether it is pushed to its short-term limits or kept within its safe range for sustainable long-term use. And while photos can show when a nib is being pushed far into the danger zone, in most cases there is a large grey area which one has to navigate by feel, not by eye.

The second scale is another story. Instead of continuing to rely upon poorly defined labels such as "easy flex", "full flex", "superflex", and the odious "wet noodle", correlating the force applied to a nib and the resulting deflection would provide a precise and uniform method of grading.

Two versions of this approach have been proposed in recent years. The first, explained in this YouTube video, entails measuring the pressure required to make the nib open up to its maximum safe width. Quite aside from the issue noted above of determining that width, this method also fails to provide figures for comparison that are truly comparable. How is one to compare a nib that writes a 2 mm line with 250 grams of pressure with another that writes a 2.2 mm line with 280 grams of pressure? Perhaps both require the same pressure to reach 2 mm, but one just happened to have been pushed a bit harder. But there's no telling, since the measurements were not made at a standard angle of deflection.

Addressing this problem, another method fixes the nib opening at a standard figure of 1 mm, further specifying an angle of 45 degrees between pen and paper. This is a definite step forward, though it is still not as exact or comprehensive as might be desired. As a practical matter, it is more than a little awkward to press a pen down on a digital scale, holding it at exactly 45 degrees, gradually increasing pressure until the tines are exactly 1 mm apart at the tip, and simultaneously noting the scale's reading. Furthermore, if one were to graph nib opening as a function of force applied, the resulting curve could vary considerably from nib to nib -- two nibs requiring identical pressure to open to 1 mm could well require substantially different amounts of pressure to open to 0.5 mm, or to 1.5 mm. Finally, 1 mm may be more than is safe for some nibs, especially smaller ones.

For informal use, the 1 mm method is approximate but simple, requiring only the absolute minimum of equipment. With only a little more work, however, much better measurements are possible. The pen holding apparatus shown below was thrown together using scrap wood and miscellaneous hardware. The digital scale is a cheap Harbor Freight unit, with the nib tip resting on a square of sheet acrylic. The pen is clamped between guide rails set at 45 degrees, and pressure on the nib can be varied by hanging weights (not shown) on the pivoted support arm.

This setup, along with a measuring magnifier, makes it easy to determine the exact pressure required to achieve a 1 mm opening. Even better, it allows for a much more complete picture of a nib's performance. For example, instead of using nib opening as the benchmark and then determining the pressure required, pressure can be used as the benchmark and the resulting line width measured. This can then be repeated with multiple pressure settings -- 100, 200, and 300 grams would cover the essential range.

Over the next week or so I will record and report measurement results for various pens, including some dip pen nibs favored by calligraphers for their flexibility. The latter should offer an invaluable benchmark. I will also start to report test results for flex nib pens I list on eBay, which may push other sellers to provide similar data. [Very belated followup post here]

ADDENDUM: Antonis Zavaliangos commented on the issue of dealing with friction -- in particular, frictional resistance to the spreading of the tines. While the use of an acrylic surface will reduce that friction, my preferred method (as planned) is to adjust the pressure to a convenient benchmark with the nib on the acrylic -- 100g, say -- then to ink the nib, put a sheet of paper over the acrylic, set the nib on the paper, and pull the paper out from under the nib. That way the nib will have the opportunity to open up fully, as it might not in a static test. It will also be much easier and more accurate to measure the resulting line's width than to measure the gap between the tines at the very tip.