Alan Mays' photos with the keyword: calculators

For the other side of this wheel chart , see the Keystone Automobile Club Safe Driving Calculator (below). "How Quickly Can You Stop? The average stopping distances in the Keystone Calculator are based on the average breaking distance plus the distance covered in ¾ of a second, which is the average 'reaction time,' the period which elapses between the instant danger is observed and the actual application of the brakes. . . . Keystone Automobile Club. The Motorist's Friend Since 1906."

For the other side of this wheel chart , see How Quickly Can You Stop? (below). "Keystone Automobile Club Safe Driving Calculator. Miles per hour: 55. Feet per second: 81. Average stopping distance: 271. See other side."

In this detail from a 1925 photo of the Lewis Walker Company Office , a young man is working diligently at his desk as he ignores the photographer who's taking his picture. The man is surrounded by the tools of his job. A clock and a holder with several rubber stamps are among the items I could identify on the desk. There's a pencil sharpener mounted on the windowsill, and a candlestick telephone is visible on another desk that's situated behind the man. See also the full version of this photo and a close-up of the equipment in the center of the room .

A Vintage Photos Theme Park photo for the theme of furniture (one piece or a roomful; extra credit if your photo includes something instead of—or in addition to—a chair or a table, which we featured in previous themes) . Penciled notation on this photo: "Lewis Walker Co., 2/25." I haven't been able to locate any definitive information about the Lewis Walker Company, but I believe that it was located somewhere in Pennsylvania, possibly in Pittsburgh. The photo shows an office full of furniture and equipment. A solitary man sits at a desk , and additional desks, tables, chairs, and bookcases fill up the rest of the room. Interesting items in the middle of the room include a Dalton Adding Machine on its own stand, a Comptometer case on a desk, and a calendar hanging on the wall. See also close-ups of the man seated at the desk and the equipment in the center of the photo .

A number of interesting details are visible in this detail from the center section of this 1925 photo of the Lewis Walker Company Office . First, a Dalton Adding Machine is positioned on its own stand in the foreground. The machine was capable of printing calculations onto the paper from the roll that's positioned on top. Secondly, a case for a Comptometer —"the first commercially successful key-driven mechanical calculator"—is lying on the desk located behind and to the left of the Dalton machine. The label on the outside of the Comptometer box says, "Comptometer (Pronounced like thermometer). Felt & Tarrant Mfg. Co., Chicago, U.S.A. Adds. Divides. Multiplies. Subtracts." Finally, an advertising calendar hanging on the wall at the back of the room confirms that the photo was taken in February 1925 and suggests that the location may be Pittsburgh or somewhere else in western Pennsylvania. The advertisement on the calendar says, "Brown & Zortman Machinery Company, machinists supply company, machine shop equipment and supplies, Pittsburgh, Pa. February 1925." See also the full version of this photo and a close-up of the man seated at the desk .