Measuring inaccessible distances, [157];
the width of a river, [157], [158];
height of a tree, [159], [160];
height of objects, [161]
Medicine case, [136]
Mensuration, [175]
Mercury, Retort for small quantities of, [143];
Mode of supplying, to mortar boxes, [145]
Mercury extractor, [155]
Metals, [33]