INTRODUCTION 
13 
A small Lucas sounding-machine was presented to the Lake Survey 
by the Telegraph Construction and Maintenance Company, and, 
although rather heavy for constant transport, was used with great 
Fig, 6.' — Small Sounding-Machine for use in small and shallow lochs. 
success in the larger lochs for sounding and taking temperatures in 
deep water. This machine and one of the Pullar sounding-machines 
complete turn round a measuring pulley (G), then through a grease-box (M), and 
over a guide pulley (H) to the weight (I), which takes the form of a sounding- 
tube constructed to procure a sample of the deposit, with flap-valve (J) at the 
foot, the wire being attached to the weight by means of a splice and clip- 
hook. The measuring pulley has a circumference of nearly one foot (measured 
through the centre of the wire it is exactly one foot), so that for every foot of 
wire which runs out the measuring pulley makes one revolution. The motion 
of the measuring pulley is transmitted to a series of indicating dials (1, 2, 
and 3), one recording feet, another tens, and a third hundreds of feet. When 
the weight strikes the bottom the motion ceases, and the depth may be read 
off the indicating dials. The dials fitted to the present machine read only to 
a depth of 999 feet 6 inches, but by the addition of an extra dial greater depths 
could be sounded. 
