Thermometer Rack 
The thermometer rack is circular. It is designed 
to hold 24 deep-sea reversing thermometers about 
its perimeter, each secured by a screw-adjustable 
rubber-faced cup at one end and a similar, spring- 
loaded cup at the other end (fig. 4). This is for 
speed and ease of mounting thermometers of various 
lengths. Provision is also made for mounting 24 sur- 
face thermometers between the deep-sea mounts. 
These fittings are attached to two Micarta disks, 
supported by a central shaft which can be rotated 
to bring each thermometer in front of the reading 
telescope by means of two vertical fingers projecting 
from circular plates mounted one on either end of 
the shaft. These are designed to engage a plate 
on the end of a drive shaft coming through the lid, 
which can be retracted by a solenoid to permit re- 
versal of the rack. Rack reversal is accomplished by 
mounting the rotating shaft in a framework sup- 
VERTICAL 
ADJUSTMENT 
CONTROL 
PANEL 
ported at the outer of its two vertical sides by ball 
and socket shafts, and by using bevel gears to drive 
the right-hand shaft. Power is supplied through the 
lid by a 1/20-hp reduction-gear motor on the top 
of the lid. The rack is supported by two vertical arms 
attached to the underside of the lid, the right one 
fitted with bearings for the reversing drive shaft 
and the left one with a limit switch to cut the drive 
motor when the rack is in a vertical position for 
locking onto the indexing drive. As can be seen, all 
gear in the tank is raised and lowered with the lid, 
making the rack easily accessible for loading or 
changing thermometers or for removal of the rack 
entirely when other apparatus is to be used in the 
tank. All fittings in the tank are of stainless steel. 
Tank Window 
The thermometers are read through a window 
mounted in the front side of the tank (fig. 6). This 
TANK WINDOW 
READING 
TELESCOPE 
HORIZONTAL 
ADJUSTMENT 
THERMOMETERS 
IMMERSED 
IN TANK 
Figure 6. Tank window, reading telescope, and control panel. 
