RSS / Signal
A Running Record of Findings from the Internet / September 8, 2026

He Calculated the First Fast Portrait Lens in 1840 and Was Paid Once

Joseph Petzval, a mathematician in Vienna, designed the lens on paper rather than by trial and error. It gathered roughly twenty times more light than anything before it, which is what made portrait daguerreotypes possible at all. He never patented it, and Voigtlander manufactured it for decades.

Read the story

By Fstoppers

Voigtlander objective, 1840
Voigtlander objective, 1840
Design

  1. A Seventy-Thousand-Metre Library With a Roof Shaped Like Book Pages

    Dezeen·Sep 8

  2. A Timber Campus Outside Paris, With an Orangerie and a Cross-Shaped Incubator

    ArchDaily·Sep 8

  3. A Museum's Overstuffed Walrus Becomes Its Mascot

    BP&O·Sep 3

  4. Ledgestone Tracks and Seeded Pavers, in Place of a Concrete Driveway

    Ledgestone Tracks and Seeded Pavers, in Place of a Concrete Driveway

    Gardenista·Sep 4

Arts & Culture

  1. Seven Hundred and Thirty-Seven Animals Hidden in the Bayeux Borders

    Artlyst·Sep 8

  2. Six Digital Avatars, Installed in Hospital Beds in a Closed Berlin Clinic

    Six Digital Avatars, Installed in Hospital Beds in a Closed Berlin Clinic

    Whitewall·Sep 7

  3. An Inverted Latex Umbrella That Doubles as a Birdbath

    ArtAsiaPacific·Sep 7

  4. A Calais Mural That Paints Named Residents Into a Fort

    StreetArtNews·Sep 5

Sound
  1. The No-Neck Blues Band Refused the Studio, Then Went Quiet for Seventeen Years

    The No-Neck Blues Band Refused the Studio, Then Went Quiet for Seventeen Years

    Bandcamp Daily·Sep 8

  2. One Hundred and Twenty Songs in Six Years, From a Railroad Brakeman

    American Songwriter·Sep 8

  3. A 1974 Van Halen Recording, Made in David Lee Roth's Father's House

    Louder·Sep 8

  4. Andy Williams Played on Nine Albums and Wrestled as The Butcher

    Consequence·Sep 6

Collecting

  1. The Smallest Mechanical Planetarium, Now With Its Movement Exposed

    Monochrome Watches·Sep 8

  2. The Spanish Coin That Was Legal US Tender Until 1857

    The Spanish Coin That Was Legal US Tender Until 1857

    Delcampe·Sep 7

  3. Import Games Teach More Japanese Than You Would Expect

    Time Extension·Sep 6

  4. Temples Sold Their Buddhas Cheap in 1868, and the West Bought Them

    TheCollector·Sep 5

Document

  1. Phi Beta Kappa at Two Hundred and Fifty, and What It Was Founded For

    The American Scholar·Sep 8

  2. The Man Who Founded Amnesty, and Left It Six Years Later

    British Library Blog·Sep 7

  3. A Bristol Inn, an Entity Called Malchi, and Two Years of It

    A Bristol Inn, an Entity Called Malchi, and Two Years of It

    Strange Company·Sep 7

  4. A Faceless Black Cone Was Aphrodite Before the Greeks Got Her

    Atlas Obscura·Sep 7

Film
  1. Nathan Fielder Made an Elizabeth Holmes Documentary That Will Not Sit Still

    Nathan Fielder Made an Elizabeth Holmes Documentary That Will Not Sit Still

    RogerEbert.com·Sep 8

  2. Henry Wessel Shot California Through a Car Window for Decades

    PetaPixel·Sep 6

  3. Sunset on an Extinct Volcano, Shot on a 1998 Point-and-Shoot

    35mmc·Sep 6

  4. Baldessari Put Text Over Photographs to Break Their Meaning

    Blind Magazine·Sep 5

Follow Signal

A new issue every day. The feed carries each issue in full, so nothing is held back for the site.

Subscribe by RSS