 This means that no measureable force should be generated by the laboratory devices that have been tested, or by any device that could be built and operated except near a large mass such as a neutron star.The effects measured in the laboratory are therefore not due to the local variation of the masses as originally predicted by Woodward.A first order effect could be expected if the distant masses of the universe were varying at the same frequency, however this is not probable and experimental results are likely due to other error sources.