Details of the chamber omitted from the general description in the section above labeled “The Chamber” appear in this Appendix.
The Chamber Shell
The exterior dimensions of the aluminum chamber are 56 cm long by 41 cm high by 33 cm wide. There are latches at either end (part of the latch on the work-area end is missing), centered on the short sides of the chest. Except for the attachment of a ventilation fan and a single aperture to accommodate the electrical cable, the chest otherwise looks like any other of this product line. The connecting cable that protrudes from the work panel through the rear wall appears to be original. It is 180 cm long, excluding the male Jones plugs (12 prong) connected to either end. The connector at the end distal to the chamber was attached to either directly to the programming apparatus or to a female connector, which in turn attached to another cable that connected to the programming apparatus that controlled the contingencies to which the pigeon in the chamber was to be exposed. The cable covering is of a heavy fabric, rather than the later plastic cable coatings/coverings. The ventilation fan (shown in Fig. 2 on the rear long side of the chamber) is powered from a plug that connects through the ice chest wall to another plug located on the back side of the work panel. The fan housing is 11.5 cm long by 8 cm high, and protrudes 9.5 cm from the outer wall. It is powered by a 110 v AC motor, manufactured by Fasco Industries of Rochester, NY (model number 507451N (the last letter is slightly marred, so it could be another letter). The opening for the fan on the inside of the chamber is 15.5 cm from the top and 9.5 cm from the rear wall of the service area. The hinges for the chamber lid are located on either end of the lid, as can be seen in the right photograph of Fig. 3. Attached around the inside perimeter of the lip of the ice chest is a rubber gasket (indicated by two arrows in the right photograph of Fig. 3), which has come unattached in several places, but is not deteriorated.
The inside of the chamber is 50.5 cm long by 28 cm wide by 33 cm high. It is divided by an aluminum panel (hereafter, the work panel) into a work area (where the pigeon is placed), shown at the top of the left photograph and at the bottom of the right photograph of the chamber in Fig. 3, and a service area, shown at the bottom of the left photograph and the top of the right photograph in this figure. The work area measures 32.5 cm long by 28 cm wide by 33 cm high and the service area 18 cm long by 28 cm wide by 33 cm high. The opening for the ventilation fan is on the right wall of the service area (when viewing the rear of the work panel from the service area), as shown in the left photograph of Fig. 3. The floor of the work area is covered by a piece of wood, raising the work area by 3.8 cm, but it could not be determined whether this was part of the original design or was added later. We speculate that it may have been added in Japan because Japanese pigeons may not have been as tall as the ones used in the USA. If so, this may have made it more difficult for the pigeons to reach the response key.
The Work Panel
The work panel, shown in Figs. 4 and 5, is 27.2 cm wide by 32 cm high. Figures 4 shows a piece of black foam rubber (somewhat deteriorated, and difficult to determine whether original or added later) across the top such that it covers the small space that otherwise would exist at the top of the work panel between the work and service areas of the chamber (thus accounting for the difference in the chamber height and the work panel height). The foam is seen most clearly in the left photograph of Fig. 3, where the twine holding it onto the work panel also can be seen. The response key is located behind a 7.1 cm diameter opening, the center of which is about 26.8 from the chamber floor (23 cm from the wooden platform floor), on the midline (13.6 cm from the left wall) of the work panel, shown in Fig. 4. Below it is the food magazine aperture through which grain can be accessed. This aperture is 5.2 cm high by 5.6 cm wide, with its center also on the midline of the panel (13.6 cm from the left wall) and about 9.7 cm from the chamber floor (5.9 cm. from the floor of the wooden platform).
There is no means of providing general illumination through devices built into the panel; however, there is a small two-prong electric plug in the top right corner of the work panel (Fig. 4, arrow), with an unconnected wire attached to it. Inside the chamber in the work area are two candelabra type 100 v lamp holders (one of the holders contained a 110 v bulb) placed unattached on the floor directly below the loose wires. These can be seen in Fig. 3 in the upper right corner of the work area shown in the right photograph. The wires connected to the two candelabra bases appear to be old, but it cannot be determined whether they and the bases were original or not. The insulation on the wires is not plastic; rather, they are of the same fabric material as the afore-described cable wire, seemingly revealing something of its age. Whether these constituted a houselight for general illumination of the work area is not known.
Figure 5 shows rear (left photograph) and side (right photograph) views of the control side of the work panel. The single sheet of aluminum that comprises the panel is bent at a 90° angle such that its base covers the floor of the control area. The panel is braced by (now) rusty iron bars set at an angle and attached to the side lip of the work panel and its base, apparently to prevent the panel from coming out of position in the chamber as the pigeon pecks the key (there are no grooves for holding the work panel or other means of stabilizing it in the chamber). A similar, but horizontal, iron bar braces the panel from the work-area side, as noted in the “The Chamber” section above. The wiring and solder connections on the control panel appear to be original, although it is difficult to determine whether some of the connections have been re-soldered. Many of the individual wires leading to various components, however, are bundled with a wire binder holding them together and they appear to be unmodified over the years of the chamber’s residence at Keio. Located on the work panel are a connection box to which the cable connects, a response key, two stimulus lights used to transilluminate the response key, and a device for delivering mixed grain through the aforementioned aperture on the work-area side of the work panel.
A metal connection box is located in the lower left corner of the control side of the metal panel (viewing from the control area; see the left and right photographs of Fig. 5). The connector cord (connecting the box to the programming and recording equipment) is plugged into the box through a male Jones plug visible at the lower rear of the box. The box contains two 2-pole double-throw relays, function unknown. These relays sometimes were used to channel power to lights or food magazines. Some of the wires from the male 12-prong Jones plug connector go through these relays, but other wires go directly from the Jones plug connector to the various components.
The response key, shown in Fig. 6, is composed of a 6.5 cm square piece of thin black plastic on which is mounted a piece of white opaque plastic (6.4 cm high by 4 cm wide). The unit is located behind the circular opening in the work panel. The white plastic piece is unhinged and can move off its fixed location in four directions. There appears to be a small spring attached to the bracket at the top of the key assembly that holds the white, moveable portion of the key in place and ensures the return of the key to its neutral position at the end of each peck. The face of the key (the pecking surface) is recessed about 3 mm from the face of the work panel. The force requirement of the key does not appear to be adjustable. The key operation is described in the “The Chamber” section.
As noted above, the two stimulus lamps are shown in the left photographs of both Figs. 6 and 7 as the two black cylinders (marked by the short arrows, above the food magazine in Fig. 7). The one on the right (from the rear of the work panel) is placed above the plane passing through the center of the key aperture and the one on the left is placed below this plane. Their location is precise and they do not appear to have been added later, suggesting that this arrangement was part of the original chamber design, although some of the wires connected to the lights may have been cut and re-soldered. It was difficult to determine by visual inspection whether these jewel lamps (pilot lamps) were 24 v DC or 110 v AC. Twenty cm in front of the lamps is a piece of frosted glass (Fig. 6, left photograph, longer arrow), perhaps used to diffuse the light coming from the key lights and diffuse it evenly across the response key. The frosted glass is 65 mm behind the response key.
The food magazine is shown in the left photograph of Fig. 7. It is located behind the square aperture on the work-area side of the work panel. The cogwheel and lever are shown in the lower right photograph of Fig. 7. The details of its operation, and a comparison of it with the later Gerbrands model shown in the upper right photograph of Fig. 7 are described in the “The Chamber” section above. The cogwheel is rotated by a 110-v AC synchronous motor, which is not readily visible because of the cogwheel. We could not determine whether the motor operates from a single pulse and continues to operate through a reinforcement cycle or whether continuous application of current to the motor is required to ensure raising and lowering of the food tray. There is a light above the feeder aperture that presumably illuminates with the operation of the magazine.