Aperture Cards: The Last of an Art Form


Nick Edwards, a 40-year company veteran, is one of the few specialists that still creates apertures cards.
Nick Edwards, a 40-year company veteran, is one of the few specialists in the world that still creates apertures cards.

Every once in a while an email pops into my inbox that reminds me how unique The Crowley Company is. A few weeks ago, I received notice from our CEO that a major manufacturer of aperture cards in Asia had stopped production, thereby rendering our Wicks and Wilson division the world’s only manufacturer of aperture cards.

Say what?!

After embracing this fact through fantasies of royal successions (because the Wicks division is located in the U.K. and after binge-watching “The Crown” during the holiday season, I only know how to process a moment like this through visions of elaborate coronations), I realized that I didn’t know a whole lot about aperture card creation. So I set off to expand my knowledge.

I cannot say with absolute certainty that we are the only aperture card manufacturer in the world (although I kind of already did and a Google search for others proved fruitless) but I can say we may certainly be the most practiced due to the hard work and knowledge of resident “card chieftain” Nick Edwards. Nick has been designing and creating aperture cards with Wicks and Wilson for 40+ years. The long road could have diminished Nick’s passion for the craft but a brief chat with him proves that he is still enthusiastic to create a first-class product and spends a good amount of time navigating the details of each card order with precision and accuracy. Math, science, engineering and critical thinking skills are crucial when designing cards of this detailed nature and Nick’s expertise is expansive. His ability to process and conquer any card challenge is enviable, especially for those of us that aren’t mathematically inclined.

Tabulating Cards
Before the aperture hole that holds the microfilm was introduced, tabulating cards only contained Hollerith punch data.

An Extraordinarily Brief History of Aperture Cards

Punch cards in their roughest form were invented in the early 1800’s as a system to control loom weaving patterns by Joseph-Marie Jacquard. [1] Crazy, right? The technology was manipulated in different ways by various innovators such as Charles Babbage before Herman Hollerith created the electromechanical punch code around 1890.[2] Hollerith’s code became the standard language used on punch cards as we know them today.

Fast forward a few decades to the 1950s and the start of modern computers (because this is a brief history, remember?). If you love Katherine Hepburn as much as I do, you’ll probably remember her involvement with punch cards in the classic movie, “Desk Set” (1957). Katherine plays a clever reference librarian at the Federal Broadcasting Network that clashes with an efficiency expert hired to modernize the network, played by Spencer Tracy, who is working to incorporate a computer or “electronic brain” into the reference department, therefore rendering her job extinct. After many lines of quippy banter, the computer is installed (taking up the entire back wall of the office, I might add) and the reference librarians feed boxes of tabulating cards to the giant computer to “teach it” all the pieces of information contained in the library. The computer then reads the codes provided on the cards and retains it. Mr. Tracy explains the process pretty well in this scene (around 1:08).The cards that are being fed into the machine are known as tabulating cards and featured the 80-line Hollerith punch code. This code is read by the computer and the information retained in its system. Users decided they needed an easy, condensed and inexpensive way to transport and archive their images as well as information so punch cards were further adapted to include an aperture hole on the right side of the card where a microfilmed image could be placed.[3] For example, an automotive manufacturer wanting to copy and send all the technical drawings for their latest car model to a manufacturing facility on the other side of the country would need to physically copy and mail all the blueprints if they wanted to share the information. Once aperture cards were invented, the blueprints could be scaled down and the images transferred onto microfilm and placed in the cards. The cards would be easily duplicated and transported, therefore saving companies space and shipping costs by eliminating the need to ship large collections in their original form.

For decades, aperture cards were the preferred method of data storage for many industries due to their ability to be easily read, indexed, stored and quickly retrieved by computer. So why has the media fallen out of favor? In brief, digital technology. Once the internet created the immediate transfer of information, there was little need to send physical copies of the cards. According to Nick, 97% of the orders coming into our company today are placed by engineering companies in the automobile, aeronautics, naval, and aerospace industries who still prefer aperture cards for technical drawings. In some countries such as the United Kingdom and Germany, it is mandated by law that engineering companies save their drawings and records on some sort of microfilm (still the considered the longest-lasting media when stored properly). Which brings me to the question: How are aperture cards made?

Follow the Code

Aperture Cards
Aperture cards with 35mm microfilm images.

Because aperture cards are capable of holding so much information, there are numerous permutations in which the cards can be made. Nick sent me a document known as the “Microfilm Ordering Code” (below) that was not only helpful in expanding my knowledge of microfilm cards but also shows the amount of the detail that goes into creating them. Each batch of cards is defined by a seven-digit code that explains exactly how the cards should be made. The digits placed within each of these seven place values indicate the specification of that category, see below.


Card Type

The first digit of the code indicates the type of card to be made. There are a few main types of aperture cards: tabulating cards (no aperture or microfilm image), mounting cards (card with aperture hole and no microfilm), camera cards (aperture card with unexposed microfilm) and plotter cards (aperture card with special microfilm for laser etching the image). The numbers 0-9 each indicate a different type of card and the type of film required. The type of film is designated by the customer and depends on the type of card they want and what machine it will eventually go into. Film types such as blue/violet diazo film, Kodak HQ1461, Kodak S0483 and black diazo film are the most commonly used and have their own digit specification. If a client would like to order a specialty card that uses a different film type, there is an option for specialty requests.

Adhesive or Film Emulsion Placement

The second digit in the code designates the placement of adhesive for the microfilm and where the film emulsion is placed. Nick explained to me that aperture cards can either be a “master,” meaning that the card is the first card made with that information or a “copy” of a master. This digit placement indicates whether the card should be made as a master card or a copy card.

Type and Placement of Corner Cuts

The third digit in the code designates on which corner the cut is to be placed. Originally, a corner cut in the upper-left indicated that the card was a master while a upper-right cut meant that the card was a copy. This distinction fell away with the advent of aperture card scanners, the option is now up to the customer where the corner cuts are placed.

Card Color

Confession time: Aperture cards appeal to me on an aesthetic level. There is something about their buttercream color, intricate printing, fat rounded corners and sharp corner cuts that fascinate me. The fourth digit in the code conveys the color of the card and lists one option … “buff natural,” but is that really the only color that cards are supplied in? The answer is more economically-based than you would think. According to Nick, alternative colors are available if the need is great enough. Paper suppliers will only supply different colors of card stock at the specific dimensions needed for aperture cards 6 metric tons at a time, meaning that a customer would have to order around 2 million cards in order for a color other than buff natural to be cost-effective.

Aperture card
Aperture card with colored stripe at the top edge.

Stripe Color

The fifth digit in the code designates the color of a stripe. A stripe of color can be added to the card to highlight different information on the card and allow the user to quickly identify and index cards with the naked eye.

Stripe Position

As you may have guessed, the sixth digit indicates where the highlight stripe should be located.


The seventh digit in the code gives the customer a choice of ink colors to be printed on the face of the card. If a customer wants a reference number or code identification number to be printed on the card (for re-printing or identification purposes), they can specify the number in this option.

Once the cards are made, they are packaged and sent out to the customer who will put images onto the film and Hollerith code onto the card. The cards can then be viewed or digitized via an aperture card scanner (such as the C Drive X or the C400) or sent to a service bureau (such as Crowley Imaging) for digitization. How’s that for full-circle?!

Now that I know how the cards are made, I want to know more about the companies that use them … but that’s another blog for another week.



  1. http://www.columbia.edu/cu/computinghistory/jacquard.html
  2. http://www.columbia.edu/cu/computinghistory/hollerith.html
  3. https://books.google.com/books?id=CRwONNTeWe8C&pg=PA71&lpg=PA71&dq=tabulating+cards+and+microfilm&source=bl&ots=g7U0uCTyO4&sig=NfSVG4yyJILK2vXJybh2cftnCl0&hl=en&sa=X&ved=0ahUKEwiDndSuid7RAhXE4CYKHdhJD10Q6AEIJDAD#v=onepage&q=tabulating%20cards%20and%20microfilm&f=false

12 Responses

  1. Was with Meghan today at probed for Chester County PA and we touched on our need for aperture cards with a yellow stripe.
    If you can provide, please contact me unless someone else from IMR already has. Thanks,
    Also, Meghan told me about USCAN. We were the PA dealer for ScanPro for years and they cancelled our contract for whatever reasons.
    Are you interested in having a reseller in PA?
    Again contact me at you earliest at 717-503-8574
    or [email protected]

  2. In 1966, as an employee of First American Title Insurance Co. in California and building title plants with microfilm in its early expansion, I developed and patented the APERTURE CARD. I’m long retired but stumbled on your website. Wow! My last knowledge of the use of the card was the Department of Defense in 70’s though systems and equipment developed by Scionics Corp. of LA who bought the patent rights. Please put me on your mailing list. If interested I can mail you a copy of the patent.
    Walter Spicer
    19 Valley Club Circle
    Napa, CA 94558

    • Thank you for letting us know about your critical role with aperture cards, Mr. Spicer; a perfect footnote to this blog. We will do our best to continue your legacy!

  3. My company was RGS,Inc. a major manufacturer of aperture cards and diazo copy cards from the early 80s through the late 90s . 3M was are only competition.

    If you have any question about manufacturing process, please contact me.

  4. Dear Sir,

    I wonder if you still have MIL-D 35mm Protective Pocket Type or Adhesive Type Tab Size Aperture Cards. Please quote your best offer if positive.

    Thank you and look forward to hearing from you soon.

    With best regarsd,
    Tommy Chiu
    China System Co., Ltd. Hong Kong

  5. previously I have purchased cards with aperture alongside or can be used on below edges where I do thread through ribbon. the cards I have are about 7×5 or 5″ square. please can you remind me where I purchased them, please thank you?

  6. What seems an eternity ago, I was trained up by Wicks and Wilson (ca 2003) to provide service on a your Aperture Card Duplicators and the Aco 2 plotstation machines. I was recently discussing these machines with my current boss here in Norway, but have been unable to locate any images of the card duplicators anywhere online.
    Trying to explain the machine 15 years after I last had to crack open the valves on the amonia lines and I still can smell it, but wondered if you had any images of the duplicator, and the plotstation you’d be able to send me as a reminder of times past.

    • Stuart- Thank you for sharing your experience and we’re happy you’ve found us once again :). We will email you a picture and hope you enjoy reminiscing.

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