Dean had no alternative but to force her hands away and flip her from him, onto her back, reversing their positions in a single thrust that caused her to loudly gasp as she landed soundly on her back, Dean now above her.
The obvious remedy is to make all measures on opposite sides of the fixed web before reversing in position-angle - a precaution, however, which no careful observer would neglect.
The excellent manner in which the scales and micrometers are mounted, the employment of a compound microscope for viewing the scales, with its ingeniously arranged and admirably efficient reversing prism, and the perfection of its slow motions for focusing and reading, combine to render this a most accurate and convenient instrument for very refined measures, although too slow for work in which the measures must depend on single pointings in each of two reversed positions of the plate, and where speed of working is essential.
Where high speed lowering is not required it is usual to employ a reversing motor and keep it always in gear.
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