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Updated: May 24, 2025
When the Sprengel pump had done its work, the reservoir R2 was further lowered and the mercury descended in R1 and filled R2, whereupon stopcock C2 was closed. The air adhering to the walls of R1 and that absorbed by the mercury was carried off, and to free the mercury of all air the reservoir R2 was for a long time worked up and down.
Generally the process of exhaustion was the following: At the start, the stop-cocks C and C1 being open, and all other connections closed, the reservoir R2 was raised so far that the mercury filled the reservoir R1 and a part of the narrow connecting U-shaped tube.
The rafters r1 and r3 at each end of the house are half an inch thicker than the rest, as they have to stand a lot of nailing. Cutting the Rafters. Then draw a line bisecting the ridge angle. With this template as guide the rafters can be quickly cut to shape.
The U-shaped tube was provided with a stopcock C, and two ground connections g and g1 one for a small bulb b, usually containing caustic potash, and the other for the receiver r, to be exhausted. The reservoir R1 was connected by means of a rubber tube to a slightly larger reservoir R2, each of the two reservoirs being provided with a stopcock C1 and C2, respectively.
Assemble the rocking lever in its support and the rod forks, and solder on the support. To the back end of R2 solder a steel plate, A, which must be bored for the pin in the valve fork, after the correct position has been ascertained by careful measurement. The stops, T1 T2, are small, adjustable collars, kept tightly in place on R1 by screws. Setting the Striker. Assemble all the parts.
The other three pairs require temporary ties halfway up to prevent straddling during erection. Door Frames and Doors. The material for the frame being 1/2 inch thicker than that of the rafters, there is room for shoulders at the top angles, as indicated by dotted lines. The door frame at the house end is of the same thickness as r1 so that no overlapping is possible.
When a new bulb was put on, the mercury was always raised above stopcock C1 which was closed, so as to always keep the mercury and both the reservoirs in fine condition, and the mercury was never withdrawn from R1 except when the pump had reached the highest degree of exhaustion. It is necessary to observe this rule if it is desired to use the apparatus to advantage.
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