Space-filling atomic models, c 1955.

Maudslay's micrometer, 1805.

Measuring distance from ship to shore, 1535.

Various instruments for measuring distance, 2000 BC-1854 AD.

Tycho Brahe's double-arc instrument for measuring angular distances, 1590.

Selection of 26 eyepieces made by Sir William Herschel, 1780-1800.

Observatory building for seven inch heliometer, Cape, 1909.

View of the 'Oxford heliometer' , 1849.

Seven inch heliometer, Cape Town, South Africa, 1909.

'Taking a Lunar Distance', 1891.

Measuring distance and angle for firing cannonballs using the quadrant, 1548.

Machine for measuring the distance travelled by wagon, 1548.