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[[blank page]] [[end page]] [[start page]] Select a position for primary signal and proceed to erect one of 4 X 4 lumber strongly stayed and anchored. Height as follows Top of staff - ft - First crosspiece 4 Second " [[ditto for: crosspiece]] 4 Notch on staff 6.6 in Mean sea level 10.7 [[line indicating sum]] 25 feet 1 in. Heights measured with Casellas altazimuth. Measure off a line very carefully with Chesterman's steel tapes & find that at 200 ft the space between the upper & lower horizontal wires of Theodolite No. 97 covers a space of sixty divisions on telemeter no. 97. Go to head of spit and select a place for a second primary station to make the other end of the baseline